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Details for Benchmark: DX4280

N 33° 54.825 W 117° 44.287 (NAD 83)

Altitude: 1785

Coordinates may not be exact. Altitude is SCALED and location is ADJUSTED. (more info)

Location:
In ORANGE county, CA View Original Datasheet
Designation:
SAN JUAN
Marker Type:
bolt
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

Must Read!

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Now that's a benchmark! Hiked up to get the geocache and figured there would be a benchmark too. This is one of the older benchmarks I've found; there might be a couple I found in Massachusetts that are older, but this is almost definitely the oldest one I've logged in CA.

[Photos:]
photoMarker and OC reference mark, looking north
photoMarker, looking South
photoMarker from above

Second time on the top of this hill, but first time logging the benchmark. Had I logged it the last time I was here, I would have been first to log it, but was unaware of benchmarks as part of geocaching at the time.

Found the OC/San Bernardino County marker as well.

[Photos:]
photoThe mark
photoLooking north
photoOrange County/San Bernardino County border
photo1896
photoSouth Facing side

Climbed san juan for the cache and seen this one....

Found while hike the hill to San Juan---

Found while geocaching on San Juan Hill. Thanks!

Located after a nice hike on South Ridge trail.

Found it with Team Geo-Clarks and Supercheeseburger.

Easy find

[Photos:]
photoDX4280
photoDX4280-1
photoDX4280-5
photoDX4280-6

Found it with Team Geo-Clarks and Dust-maker. Coords are good.

[Photos:]
photoDX4280
Station San Juan
photoDX4280-1
Copper Bolt
photoDX4280-2
RM 5
photoDX4280-3
RM 6

Found this on a Boy Scout Hike.

This entry was edited by Geocaching Cat on Friday, 17 July 2015 at 04:21:51 UTC.

Another great day of caching in Chino Hills State Park. I parked at the end of Casino Ridge Rd and had to crawl through the fence to get to Gas County Rd which was no problem. I made my way along to S Ridge trail and then on to San Juan Hill. Great view from the top. I didn't know there are a couple bench marks up here as well.

Large concrete pier is obvious, but metallic disk that may have been on top of it is long gone. At least two corner disks are located near the concrete pier. What a great view!

Did a nice 8 mile loop today from Rimcrest over to Telegraph and up to 4 corners and beyond and then came over San Juan Hill and back down South Ridge Trail. Picked up a few caches and had a few DNFers. all in all a pretty good afternoon...TFTC

Found it with jreitz1 on our way to the nearby geocache.

[Photos:]
photo034
photo035
photo036

Like the last finder noted, the tower is hard to miss, but the marker on top of the tower is gone. The were a large hole dug about 10yrs south and then about 10 yrds north we found the marker stating, "Orange County Surveyor, COR. NO. 8, 1978, S.B. Co./O. Co.

[Photos:]
photoSan Juan 1896
photoU.S. O. G. Survey
photoOrange County Surveyor, COR. NO. 8, 1978
S.B. Co/O. Co.

Hard to miss this one. Found another one dated 1978 some 20 yds away, the Orange County Surveyor's "Corner No. 8" that marks the border between Orange and San Bernardino counties. That one does not come up in the benchmark log.

Yep it's there!

What a cool benchmark! I also found a cache near here and that made it a double for this peak.

[font=Tahoma]Blasted off from work to cache/Ride 3 in [B][I][ORANGE]ORANGE[/ORANGE][/B][/I] then 7 in [B][I][GREEN]Chino Hills State Park[/GREEN][/B][/I] !!! [GREEN]~~[/GREEN][/B]
It was over 100° out here today, a bit toasty[B] ~~[/B], but worth the visit and RIDE! Parked in the residential tract and rode in on Bane Canyon to East Fence Line Trail. (That was a piece of work!) Jumped back on Bane Canyon to San Juan Hill top and Benchmark, then dropped down to 4 corners and caught 1 last cache on the way out. Played for 3.5 hours and logged 14 miles here today. Stayed till they closed the gate at dusk!

Even though I had to DNF this cache up here, I still got to see this great Benchmark and references.

[BROWN][I][B]~~ I FOUND THE BENCHMARK!!! ~~[/BROWN][/I][/B] [font=verdana]

[Photos:]
photoBenchmark DX4280 - San Juan

Was up here to look for the San Juan Hill geocache, but having failed miserably at that, I figure I might as well log this benchmark, since I used it as a reference from which to search for the geocache.

BTW, does anyone know what is up with this type of benchmark? I mean a "bolt"? If they went to the trouble of building the big concrete pillar thing with its three surrounding pylons, and placed this bolt in the pillar, couldn't they have gone the little step further and put one of those nice NGS benchmark metal disks here instead? Not complaining -- just curious...

Decided today was the day for this 1886 benchmark! Been up here previously, before Benchmark Hunting was started, and didn't get any decent pictures, so got plenty this time! I'm surprised no one else has done so before. I hiked up from the trail head off Dorinda; many ways to get here. With an interesting side trip to DX4661 on the way down, it was about 6.7 miles round trip. It would be a little shorter without the side trip, maybe 6 miles.

[Photos:]
photoDX4280 in Orange County, CA
The HUGE monument, 2 feet across the hexagonal, 3 feet tall. Datasheet has monumentation date as 1886, but I guess the pictured monument was built in 1896.
photoDX4280 in Orange County, CA
A pretty dragonfly posed for me right above the monument name!
photoDX4280 in Orange County, CA
Closeup of the dragonfly. Pic sure came out good!
photoDX4280 in Orange County, CA
The actual mark is the bolt in the top center of the monument, with the nice little dimple in it.
photoDX4280 in Orange County, CA
Bolt with GPS. Needless to say, for an adjusted mark, the mark is more accurate than the GPS! I wonder how accurate they got it in 1886? That would be interesting. Many datum changes...
photoDX4280 in Orange County, CA
View of the two pylons to support the tripod for an instrument over the mark. You can also see the backside inscription reading "US C & G Survey". Which is "United States Coast and Geodetic Survey"
photoDX4280 in Orange County, CA
Unfortunately, one of the three pylons has been broken off.
photoDX4280 RM 5, in Orange County, CA
Was able to find RM 5, but not RM 6.

Can't really miss this when atop San Juan Hill.

On a 5 mile hike with our Boy Scout Troop, and about a dozen visiting Webelos and we stopped here for a break. I though the bench mark was gone and all that was left was a near by satellite survey disk until one of the other hikers pointed out the “bolt” type marker on the pedestal. The marker is there and well, and I learned something.

[This entry was edited by BeckTrex on Monday, November 21, 2005 at 1:51:19 PM.]

Found this on a bike ride, looking for the San Juan Hill cache. Nice clear day, but a little windy.

We were on a 10 mile hike with the scout troop for the hiking merit badge. Stopped at the top of the hill for a quick break and a quick cache. Never logged a marker before.

Found this while doing a 10 mile scout hike.

Found this while caching.

Found this one while doing the San Juan Hill cache. Pretty easy to find once you make it to the top of the hill.

I found this benchmark when riding to the San Juan cache. I did not know about benchmarks then, but I did rest my bike against it and my helmet on top of it.

Have been to this one several times but didn't know about geocaching. Marker disc is missing from the last time I was up there. Showed a surveyer the easy route to the marker and saved him an hour and a half of traffic on the 91. Also saw the Orange County/San bernardino county line Marker, Corner marker number 8.

Found two more markers hers. One has-Orange County cor No. 8 1978. The second one about 20 feet away has the following inscription-US Coast Geodetic Survey refference Mark, San Juan No. 5 1886.

Documented History (by the NGS)

01/01/1886 by CGS (MONUMENTED)
01/01/1933 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1933 ABOUT 5 MILES E OF OLINDA, 5 MILES NE OF YORBA LINDA, AND ON SUMMIT OF HIGHEST AND SHARPEST PEAK OF SAN JUAN HILLS. TO REACH FROM OLIVE, GO NE 3 MILES ON SANTA ANA CANYON ROAD TOWARD CORONA. TURN LEFT ONTO FULLERTON ROAD AND GO 1.2 MILES. TURN RIGHT AND GO 1.3 MILES. TURN RIGHT ONTO OHIO STREET AND GO 0.4 MILE. TAKE RIGHT FORK WHERE MAIN ROAD BEARS LEFT AND TURN RIGHT AGAIN AT INTERSECTION. CONTINUE STRAIGHT AHEAD AT END OF PAVEMENT AND TAKE RIGHT FORK AT POINT 0.5 MILE BEYOND LAST TURN. CONTINUE 0.4 MILE AND BEAR RIGHT JUST AFTER PASSING POWER LINE. TURN LEFT INTO SMALL CANYON AND FOLLOW MAIN-TRAVELED ROAD 1.0 MILE, PASSING SMALL FARMHOUSE AND CONTINUE 0.6 MILE TO ANOTHER HOUSE. TAKE ROAD TO RIGHT WHICH RUNS E ALONG FENCE LINE AND FOLLOW 2.4 MILES TO STATION SITE. STATION PIER CAN BE SEEN ON HIGHEST HILL FOR SOME DISTANCE BEFORE REACHING IT. IN 1886 UNDERGROUND MARK WAS CROSS IN COPPER BOLT LEADED INTO DRILL HOLE 2-1/2 FEET BELOW SURFACE. SURFACE MARK WAS PROBABLY LARGE STONE. IN 1896 HEXAGONAL CONCRETE PIER, 26 INCHES ACROSS AND PROJECTING 3.1 FEET ABOVE SURFACE, WAS ERECTED, AND COPPER BOLT WITH CROSS WAS PLACED IN TOP. THREE REFERENCE STONES, WITH DRILL HOLES FILLED WITH LEAD, WERE PLACED TO N, S, AND E, EACH 6 FEET FROM STATION. CAIRN OF STONES MARKING BOUNDARY BETWEEN ORANGE AND SAN BERNARDINO COUNTIES WAS N. 33-1/2 DEG W. (MAGNETIC), DISTANT 16 FEET FROM STATION. IN 1899 REFERENCE STONES WERE RESET, THE ONE TO E BEING PLACED 6.12 FEET FROM STATION. IN 1929 REFERENCE STONES WERE SEARCHED FOR BUT NOT RECOVERED, IN 1933 CENTER OF TOP DIAGONALS OF TRANSMISSION TOWER WAS 0.5 MILE FROM STATION IN AZIMUTH 206 DEG 04 MIN 18 SEC. AND METROPOLITAN WATER DISTRICT SURVEY SIGNAL WAS 0.5 MILE FROM STATION IN AZIMUTH 309 DEG 15 MIN 50 SEC.
01/01/1939 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (ANS) STATION IS ON HIGHEST AND SHARPEST PEAK OF SAN JUAN HILLS, 5-1/2 MILES E OF OLINDA, 10 MILES NW OF CORONA AND 5 MILES NE OF YORBA LINDA. STATION MARK IS BRONZE RIVET WITH CROSS IN CENTER SET IN TOP OF HEXAGON CONCRETE PIER 3 FEET HIGH. SAN JUAN 1886 IS WRITTEN ON SIDE OF PIER IN CONCRETE. REFERENCE MARKS NOT RECOVERED. ELEVATION OF STATION 2300 FEET ABOVE SEA LEVEL. BAROMETER NO.212. TO REACH FROM ATWOOD GO E ON HIGHWAY 14 FOR 1.6 MILES AND TURN LEFT OFF HIGHWAY, (SIGN, YORBA LINDA 3 MILES), GO 0.7 MILE AND KEEP STRAIGHT AHEAD ON RIGHT FORK, GO 0.7 MILE AND KEEP STRAIGHT AHEAD, GO 0.1 MILE AND TURN RIGHT ON OHIO STREET, GO 0.5 MILE AND TURN RIGHT, E, GO 0.2 MILE AND KEEP RIGHT FORK STRAIGHT AHEAD, PAVEMENT ENDS, GO 0.25 MILES AND KEEP STRAIGHT AHEAD ON RIGHT FORK ALONG TELEPHONE LINE, GO 0.4 MILE AND CROSS BENEATH POWER LINE, GO 0.1 MILE AND KEEP STRAIGHT AHEAD ON MAIN TRAVELED ROAD, GO 1.1 MILE AND PASS RANCH HOUSE, GO 0.6 MILE AND TURN RIGHT ALONG FENCE LINE AT GATE ENTRANCE TO SECOND RANCH HOUSE, TO 2.6 MILES AND KEEP RIGHT FORK, MAIN TRAVELED ROAD, GO 0.2 MILE AND TURN RIGHT OFF GRADED ROAD, GO 0.2 MILE UP HILL TO STATION ON HIGHEST POINT.
01/01/1951 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1951 (RBF) FOUND BRONZE RIVET WITH CENTER PUNCH MARK NOT CHISELED CROSS, IN TOP OF HEXAGONAL CONCRETE PIER, 26 FEET ACROSS AND 3 FEET HIGH. THIS STATION IS ON THE HIGHEST AND SHARPEST PEAK OF THE SAN JUAN HILLS. CONCRETE PIER HAS U.S.C. AND G SURVEY (NOTE THAT AND IS ILLEGIBLE AND SUR IS SMEARED OVER WITH FRESH CEMENT) ON THE S SIDE, AND ON THE N SIDE IS INSCRIBED SAN JUAN 1896. ALSO 3 CEMENT PIERS, INSIDE OF A 6-INCH STEEL PIPE FOR TRANSIT TRIPOD LEGS WERE FOUND. ALSO FOUND WHAT APPEARS TO BE THE CHISELED REMAINS OF A STANDARD BRONZE BM DISK ON TOP OF THE HEXAGONAL CEMENT PIER. ALL THAT IS LEFT OF THE DISK IS A 1X1-INCH TRIANGLE WITH THE CROSS MARK. WHAT APPEARS TO BE A REFERENCE STONE WAS FOUND ON THE SE SIDE OF THE HEXAGONAL PIER. LEAD AND COPPER PIN WERE FOUND IN STONE. MEASUREMENT TO CENTER OF PIER AND COPPER RIVET WAS 6.17 FEET AND TO THE REMAINS OF THE BRONZE BM DISK 6.62 FEET. ALSO REMAINS OF A CAIRN OF STONES MARKING BOUNDARY BETWEEN ORANGE AND SAN BERNARDINO COUNTIES WERE FOUND AT N 33.5 DEG W (MAG) AND 16 FEET DISTANT. TOP DIAGONALS OF TRANSMISSION TOWER IS 0.5 MILE AND AN AZIMUTH OF 206 DEG 04 MIN 18 SEC FROM STATION APPEARS TO BE IN GOOD ORDER, BUT NO CHECK ON AZIMUTH WAS FOUND AND THE DESCRIPTION OF THE EXACT SPOT ON DIAGONALS APPEARS TO BE VAGUE. METROPOLITAN WATER DISTRICT SURVEY SIGNAL WAS SEARCHED FOR BUT APPEARS TO BE MISSING. DESCRIPTION STATES THAT ELEVATION OF STATION IS 2300 FEET ABOVE SEA LEVEL WHICH APPEARS TO BE IN ERROR. ALSO PAINTED ON THE N SIDE OF THE CONCRETE HEXAGONAL PIER APPEARS TO BE FIGURES 1781.80 BUT THE NUMBER ARE HARDLY LEGIBLE.
01/01/1953 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1953 (RAG) THE STATION MARK AND ONE STONE REFERENCE POST WERE RECOVERED IN GOOD CONDITION. THE OTHER TWO STONE REFERENCE POSTS AND THE CAIRN OF STONES MARKING BOUNDARY BETWEEN COUNTIES WERE SEARCHED FOR BUT NOT RECOVERED. TWO NEW REFERENCE MARKS WERE SET. NEW MARKS ARE STANDARD BRONZE DISKS BRAZED IN TOP OF 2-INCH SOIL PIPES. THE 1939 DESCRIPTION AND ROUTE TO THE STATION IS ADEQUATE. A BLADED ROAD RECENTLY BUILT BY THE SOUTHERN COUNTIES GAS COMPANY OF CALIFORNIA WAS FOUND TO BE A BETTER ROUTE. THE ALTERNATE ROUTE IS AS FOLLOWS--TO REACH FROM THE INTERSECTION OF YORBA LINDA BLVD. AND LAKE VIEW DRIVE IN YORBA LINDA, GO NORTH ON LAKE VIEW DRIVE 0.7 MILE TO ORIENTE DRIVE. TURN RIGHT ON ORIENTE DRIVE, GO 0.6 MILE TO OHIO STREET. TURN LEFT ON OHIO STREET, GO 0.35 MILE TO FORKS. KEEP RIGHT FORK, PASS THROUGH GATE AND FOLLOW BLADED ROAD ALONG THE RIDGES, EASTERLY, FOR 4.1 MILES TO FORKS. KEEP LEFT FORK, GO 0.9 MILE THENCE BEAR RIGHT UP GRADE 0.1 MILE TO SUMMIT AND THE STATION. REFERENCE MARK 3 IS 12.857 METERS (42.18 FEET) FROM STATION IN AZIMUTH 11 DEG 49 MIN 06 SEC. THE MARK PROJECTS 6 INCHES AND THE DISK IS STAMPED SAN JUAN NO 3 1886. THE STONE REFERENCE POST IS 1.885 METERS (6.18 FEET) FROM STATION IN AZIMUTH 84 DEG 07 MIN 11 SEC. THE MARK PROJECTS 2 INCHES AND THE MARK IS A SAND ROCK WITH A DRILL HOLE FILLED WITH LEAD. REFERENCE MARK 4 IS 11.898 METERS (39.02 FEET) FROM STATION IN AZIMUTH 116 DEG 19 MIN 09 SEC. THE MARK PROJECTS 10 INCHES AND THE DISK IS STAMPED SAN JUAN NO 4 1886. NOTE--A 6 FT. STAND WAS USED.
01/01/1956 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956 (RLE) THE STATION MARK AND THE TWO PIPE REFERENCE MARKS WERE FOUND IN GOOD CONDITION. THE REFERENCE POST MENTIONED IN THE 1953 DESCRIPTION WAS SEARCHED FOR BUT NOT RECOVERED. A NEW AZIMUTH MARK WAS SET BY THIS PARTY. FOLLOWING IS A NEW AND COMPLETE DESCRIPTION. THE STATION IS LOCATED ABOUT 5 MILES EAST OF OLINDA, 5 MILES NORTHEAST OF YORBA LINDA AND ON THE SUMMIT OF THE HIGHEST AND SHARPEST PEAK OF THE SAN JUAN HILLS. THE STATION IS MARKED WITH A 3/4-INCH COPPER BOLT, PUNCH MARK IN THE CENTER, FLUSH IN THE TOP OF A HEXAGONAL CONCRETE PIER, 26 INCHES IN DIAMETER AND PROJECTS 36 INCHES ABOVE THE GROUND. REFERENCE MARK NO. 3 IS A STANDARD DISK BRAZED TO THE TOP OF A 2 INCH SOIL PIPE, IT IS STAMPED SAN JUAN NO 3 1886, AND PROJECTS 12 INCHES. REFERENCE MARK NO. 4 IS A STANDARD DISK BRAZED TO THE TOP OF A 2 INCH SOIL PIPE, IT IS STAMPED SAN JUAN NO 4 1886 AND PROJECTS 10 INCHES. AZIMUTH MARK IS A STANDARD DISK SET IN A DRILL HOLE IN AN IRREGULAR SHAPED BOULDER, 14 FEET SOUTH OF A STEEL GATE AND 1 FOOT WEST OF A FENCE, IT IS STAMPED SAN JUAN 1886 1956. REACHED FROM THE POST OFFICE IN YORBA LINDA BY GOING NORTH FOR 0.05 MILE TO A CROSS STREET, TURN RIGHT AND GO EAST FOR 0.15 MILE TO A T JUNCTION, TURN LEFT AND GO 0.15 MILE TO ORIENTE STREET, TURN RIGHT AND GO 0.45 MILE TO OHIO STREET, TURN LEFT AND GO 0.25 MILE TO A GATE ON THE RIGHT, GO THROUGH GATE AND FOLLOW BLADED ROAD FOR 1.05 MILE TO A T JUNCTION, TURN RIGHT AND GO 3.3 MILES TO THE AZIMUTH ON THE RIGHT AS DESCRIBED, CONTINUE THROUGH GATE FOLLOWING BLADED ROAD FOR 0.7 MILES TO A POINT WHERE THE ROAD TURNS LEFT AROUND THE HIGHEST HILL, CONTINUE STRAIGHT AHEAD, LEAVING ROAD AND GO 0.1 MILE TO THE HIGHEST POINT AND STATION.
01/01/1958 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1958 (WRH) THE STATION WAS RECOVERED AS DESCRIBED AND ALL MARKS WERE FOUND IN GOOD CONDITION. A NEW AZIMUTH MARK WAS ESTABLISHED. A COMPLETE DESCRIPTION FOLLOWS. THE STATION IS LOCATED AIRLINE, ABOUT 10 MILES WEST-NORTHWEST OF CORONA, ABOUT 5 MILES NORTHEAST OF YORBA LINDA, ABOUT 2-1/2 MILES NORTH OF SANTA ANA CANYON AND ABOUT 2-1/3 MILES EAST-SOUTHEAST OF GILMAN LOOKOUT TOWER, ON THE HIGHEST POINT OF SAN JUAN HILLS. THE STATION IS A BRONZE RIVET WITH A HOLE IN THE CENTER, SET IN TOP OF A HEXAGONAL MONUMENT WHICH IS ABOUT 24 INCHES IN DIAMETER AND PROJECTS ABOUT 40 INCHES ABOVE THE GROUND. A REFERENCE MARK WHICH THE NUMBER IS UNKNOWN IS A COPPER PLUG SET IN A DRILL HOLE IN A SMALL STONE WHICH PROJECTS ABOUT 2 INCHES ABOVE THE GROUND AND IS ABOUT 3 FEET LOWER THAN THE STATION. REFERENCE MARK NUMBER THREE IS A STANDARD DISK STAMPED SAN JUAN NO 3 1886 BRAZED TO THE TOP OF A 2-INCH IRON PIPE WHICH PROJECTS ABOUT 14 INCHES ABOVE THE GROUND AND IS ABOUT 4 FEET LOWER THAN THE STATION. REFERENCE MARK NUMBER FOUR IS A STANDARD DISK STAMPED SAN JUAN NO 4 1886 BRAZED TO THE TOP OF A 2-INCH IRON PIPE WHICH PROJECTS ABOUT 10 INCHES ABOVE THE GROUND AND IS ABOUT 3 FEET LOWER THAN THE STATION. THE AZIMUTH MARK IS A STANDARD DISK STAMPED SAN JUAN 1886 SET IN TOP OF A 10-INCH SQUARE CONCRETE MONUMENT WHICH PROJECTS ABOUT 4 INCHES ABOVE THE GROUND. IT IS ON TOP OF A RIDGE, 10 FEET SOUTH OF THE CENTER LINE OF THE ROAD WHICH LEADS TO THE STATION. TO REACH THE STATION FROM THE JUNCTION OF U.S. HIGHWAY 91 AND STATE HIGHWAY 71, WHICH IS ABOUT 3 MILES WEST OF CORONA, GO WEST ON U.S. HIGHWAY 91 FOR 10.3 MILES TO A PAVED ROAD ON THE RIGHT AND A SIGN ATWOOD. TURN RIGHT OFF THE HIGHWAY AND GO NORTH FOR 0.75 MILE. CROSS THE RAILROAD TRACKS, TURN RIGHT AND GO EAST FOR 2.7 MILES TO A GATE ON THE LEFT. TURN LEFT, PASS THROUGH THE GATE AND GO NORTHERLY ON A GRADED ROAD FOR 0.9 MILE. TAKE THE RIGHT FORK AND GO NORTHERLY FOR 0.4 MILE. TURN LEFT AT THE T-ROAD AND GO WEST FOR 0.15 MILE. TURN SHARP RIGHT AT THE REVERSE Y-FORK AND GO DOWNHILL, THEN LEFT NORTHWESTERLY UPHILL FOR 0.4 MILE. TURN SHARP RIGHT AT AN OIL WELL, PASS TO THE LEFT OF TWO STEEL TANKS AND GO UPHILL ON A TRACK ROAD, EASTERLY FOR 1.4 MILES TO THE SECOND ONE OF TWO GATES. PASS THROUGH AND GO NORTH AND EAST FOR 0.2 MILE TO THE AZIMUTH MARK ON THE RIGHT, SOUTH SIDE. CONTINUE EAST THEN GO NORTHERLY FOR 0.85 MILE. TURN LEFT AT THE T-ROAD AND GO WEST FOR 0.2 MILE. TURN SHARP LEFT AT THE REVERSE Y-FORK AND GO NORTHEAST UP THE STEEP HILL FOR 0.05 MILE TO THE HIGHEST POINT AND THE STATION.
01/01/1962 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1962 (CAA) STATION WAS RECOVERED AND STATION MARK AND AZIMUTH MARK WERE FOUND TO BE IN GOOD CONDITION. REFERENCE MARKS 3 AND 4 WERE FOUND DESTROYED AND REFERENCE MARKS 5 AND 6 WERE ESTABLISHED. A SLIGHT DIFFERENCE WAS FOUND IN THE DIRECTION TO THE AZIMUTH MARK. A COMPLETE NEW DESCRIPTION FOLLOWS-- STATION IS ABOUT 5-1/2 MILES EAST OF OLINDA, ABOUT 5 MILES NORTHEAST OF YORBA LINDA, ABOUT 2-1/2 MILES NORTH OF THE RIVERSIDE FREEWAY AND ON THE HIGHEST AND SHARPEST PEAK OF SAN JUAN HILLS. TO REACH FROM INTERSECTION OF S. BREA BLVD. AND IMPERIAL HIGHWAY IN BREA, GO EASTERLY ON IMPERIAL HIGHWAY FOR 2.9 MILES TO CROSSROAD (VALENCIS AVENUE), TURN LEFT ON VALENCIA AVENUE AND GO NORTHERLY FOR 0.7 MILE PASSING UNION OIL CO. RESEARCH PLANT ON RIGHT TO CROSSROAD, CONTINUE STRAIGHT AHEAD ON VALENCIA AVENUE FOR 0.2 MILES TO FORK, KEEP RIGHT ON CARBON CANYON ROAD FOR 1.25 MILES TO (LA BREA POLICE POSSE HORSE CORRALS) ON LEFT, CONTINUE 0.05 MILE TO A NARROW ROAD RIGHT OF HIGHWAY AT SIGN (DANGEROUS FIRE AREA), KEEP RIGHT OFF HIGHWAY AND FOLLOW NARROW ROAD FOR 0.3 MILE TO LOCKED GATE, PASS THROUGH GATE AND KEEP RIGHT FORK AND GO 0.3 MILE TO CORRALS ON LEFT AT CATTLE GUARD, CONTINUE ON MAIN ROAD UP DRAW FOR 0.6 MILE TO FORK, KEEP RIGHT AND GO 0.5 MILE UP DRAW TO FORK, KEEP RIGHT AND GO UP HILL ON SWITCH BACK ROAD AND FOLLOW MAIN ROAD ON RIDGE FOR 0.9 MILE TO A SIDE ROAD RIGHT AND SIGN ON LEFT (YORBA LINDA 2 MILES), CONTINUE STRAIGHT AHEAD EASTERLY ON MAIN ROAD FOR 0.7 MILE TO LOCKED GATE, PASS THROUGH GATE AND CONTINUE EASTERLY FOR 0.15 MILE TO SIDE ROAD RIGHT, CONTINUE STRAIGHT AHEAD EASTERLY FOR 0.7 MILE TO GATE, PASS THROUGH GATE AND CONTINUE EASTERLY 0.15 MILE TO SIDE ROAD LEFT, CONTINUE EASTERLY 0.2 MILE TO GATE, PASS THROUGH GATE AND GO EASTERLY AND THEN NORTHERLY 0.2 MILE TO GATE UNDER POWER LINES, PASS THROUGH GATE AND GO EASTERLY 0.05 MILE TO SIDE ROAD RIGHT, CONTINUE STRAIGHT AHEAD EASTERLY ON RIDGE FOR 0.35 MILE TO GATE, CONTINUE EASTERLY ON RIDGE FOR 0.35 MILE TO FORK, KEEP LEFT AND GO 0.25 MILE TO SIDE ROAD LEFT AND GATE, PASS THROUGH GATE AND CONTINUE EASTERLY 0.6 MILE TO SIDE ROAD LEFT, CONTINUE STRAIGHT AHEAD FOR ABOUT 200 FEET TO FORK, KEEP RIGHT UP HILL ON TRACK ROAD FOR 0.1 MILE TO TOP OF HILL AND STATION. STATION MARK IS A HEXAGON SHAPED CONCRETE POST WHICH MEASURE 2 FEET ACROSS AND PROJECTS ABOUT 3 FEET. THE STAMPING ON THE NORTH SIDE OF THE MARK IS SAN JUAN 1896. THE STATION IS ON THE CENTER OF THE TOP OF PEAK, 38 FEET NORTHEAST OF THE WITNESS POST AND 37.4 FEET SOUTHEAST OF A WITNESS POST. REFERENCE MARK 5, A STANDARD REFERENCE DISK STAMPED SAN JUAN NO 5 1886, IS SET IN THE TOP OF A CONCRETE CYLINDER WHICH PROJECTS ABOUT 2 INCHES ABOVE THE GROUND. THE MARK IS ABOUT 5 FEET LOWER IN ELEVATION THAN THE STATION MARK AND 3.6 FEET SOUTHEAST OF WITNESS POST. REFERENCE MARK 6, A STANDARD REFERENCE DISK STAMPED SAN JUAN NO 6 1886, IS SET IN THE TOP OF A CONCRETE CYLINDER WHICH IS SET FLUSH WITH THE SURFACE OF THE GROUND. THE MARK IS ABOUT 3 FEET LOWER IN ELEVATION THAN THE STATION AND 2.9 FEET NORTH-NORTHEAST OF THE WITNESS POST. AZIMUTH MARK, A STANDARD AZIMUTH DISK STAMPED SAN JUAN 1886, IS SET IN THE TOP OF A 8 INCH SQUARE CONCRETE POST. THE MARK IS 9 FEET SOUTH OF THE CENTER OF TRACK ROAD. HEIGHT OF LIGHT ABOVE STATION MARK 1 METERS.
01/01/1963 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1963 (LGB) THE STATION MARK, REFERENCE MARKS 5, 6 AND THE AZIMUTH MARK WERE RECOVERED IN GOOD CONDITION WITH NO INDICATED DISPLACEMENT OF THE MARKS NOTED AT THIS TIME. A NEW DESCRIPTION WITH ADDITIONS AND CORRECTIONS IS AS FOLLOWS. THE STATION IS LOCATED AIRLINE, ABOUT 5 MILES EAST OF OLINDA, 5 MILES NORTHEAST OF YORBA LINDA AND ON THE HIGHEST POINT OF THE SAN JUAN HILLS. THE PROPERTY IS OWNED BY THE RANCHO SANTA ANA. TO REACH THE STATION FROM THE JUNCTION OF U.S. HIGHWAY 91 AND STATE HIGHWAY 71 WHICH IS 3 MILES WEST OF CORONA, GO WEST ON U.S. HIGHWAY 91 FOR 9.0 MILES TO THE CANYON CAFE ON THE LEFT. CONTINUE WEST ON THE HIGHWAY FOR 1.3 MILES TO A PAVED SIDE ROAD RIGHT AND SIGN ON THE RIGHT YORBA LINDA 4. TURN RIGHT AND GO NORTH ON THE PAVED ROAD FOR 0.7 MILE TO A CROSSROAD JUST AFTER CROSSING RAILROAD TRACK. TURN RIGHT AND GO EAST ON A PAVED ROAD FOR 2.8 MILES TO A PAVED SIDE ROAD LEFT AND A SIGN ON THE LEFT METROPOLITAN WATER DISTRICT OF SOUTHERN CALIFORNIA. TURN LEFT AND GO NORTH ON A OILED ROAD FOR 1.35 MILES TO A T-ROAD JUNCTION AT THE TOP OF A GRADE. TURN LEFT AND GO WEST ON A BLADED ROAD FOR 0.3 MILE TO A SIDE ROAD RIGHT. TURN SHARP RIGHT AND GO DOWN HILL ON A BLADED ROAD, THENCE NORTH UPHILL FOR 0.45 MILE TO A BLADED AREA AND TWO OIL STORAGE TANKS ON THE RIGHT. TURN RIGHT, PASSING TO THE LEFT OF THE STORAGE TANKS AND GO EAST, UPHILL, ON A TRACK ROAD FOR 0.7 MILE TO A LOCKED GATE. (KEY CAN BE OBTAINED FROM THE RANCHO SANTA ANA HEADQUARTERS.) PASS THROUGH THE GATE AND CONTINUE EAST AND NORTH ON THE TRACK ROAD FOR 0.8 MILE TO A GATE. PASS THROUGH THE GATE AND CONTINUE NORTH ON THE TRACK ROAD FOR 0.15 MILE TO THE AZIMUTH MARK ON THE RIGHT. CONTINUE NORTH ON THE TRACK ROAD FOR 0.75 MILE TO A FORK. TAKE RIGHT FORK AND CONTINUE NORTH ON A TRACK ROAD FOR 0.15 MILE TO A DIM TRACK ROAD LEFT. TURN LEFT AND GO WEST, UPHILL, FOR 0.15 MILE TO THE HIGHEST POINT AND THE STATION. THE STATION MARK IS A 1/2 INCH COPPER BOLT WITH A HOLE PUNCHED IN THE TOP. IT IS CEMENTED IN THE TOP OF A HEXAGON SHAPED CONCRETE PIER WHICH IS 2.1 FEET IN DIAMETER AND 3.15 FEET HIGH. IT IS ON THE HIGHEST POINT OF THE HILL. SAN JUAN 1896 AND A TRIANGLE ARE WRITTEN IN CEMENT ON THE NORTH SIDE OF THE PIER. REFERENCE MARK 5 IS A STANDARD DISK, STAMPED SAN JUAN NO 5 1886, SET IN THE TOP OF A ROUND CONCRETE MONUMENT 12 INCHES IN DIAMETER AND PROJECTS ABOUT 2 INCHES ABOVE THE SURFACE OF THE GROUND. IT IS 4.7 FEET SOUTHEAST OF A METAL WITNESS POST AND ABOUT 4 FEET LOWER IN ELEVATION THAN THE STATION. REFERENCE MARK 6 IS A STANDARD DISK, STAMPED SAN JUAN NO 6 1886, SET IN THE TOP OF A ROUND CONCRETE MONUMENT 12 INCHES IN DIAMETER AND IS FLUSH WITH THE SURFACE OF THE GROUND. IT IS 3 FEET NORTHEAST OF A METAL WITNESS POST AND IS ABOUT 5 FEET LOWER IN ELEVATION THAN THE STATION. THE AZIMUTH MARK IS A STANDARD DISK, STAMPED SAN JUAN 1886, SET IN THE TOP OF A 10-INCH SQUARE CONCRETE MONUMENT WHICH PROJECTS ABOUT 3 INCHES ABOVE THE SURFACE OF THE GROUND. IT IS 9 FEET SOUTH OF THE CENTER OF A TRACK ROAD.
01/01/1965 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1965 (MLG) THE STATION, REFERENCE MARKS 5 AND 6 AND THE AZIMUTH MARK WERE RECOVERED AS DESCRIBED BY IGB-63 IN GOOD CONDITION.
01/01/1970 by CA-059 (MONUMENTED)
RECOVERY NOTE BY ORANGE COUNTY CALIFORNIA 1970 THE STATION AND REFERENCE MARKS WERE RECOVERED AS DESCRIBED. THE DESCRIPTION TO REACH THE STATION IS ADEQUATE.
01/01/1972 by NGS (MONUMENTED)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972 (RH) STATION, AZIMUTH MARKS AND REFERENCE MARKS WERE RECOVERED IN GOOD CONDITION. A NEW TO REACH DESCRIPTION FOLLOWS. TO REACH THE STATION FROM THE INTERSECTION OF CALIFORNIA HIGHWAY 71 AND CALIFORNIA HIGHWAY 142 (MERRILL AVENUE) GO SOUTH ON CALIFORNIA HIGHWAY 71, 1.1 MILES, TURN RIGHT ON LOS SERRANOS ROAD FOR ABOUT 200 FT, THEN LEFT ON POMONA RINKON ROAD FOR 0.8 MILE TO DIRT ROAD ON RIGHT AT SOUTH EDGE OF BRICK PLANT. TURN RIGHT AND FOLLOW DIRT ROAD 0.4 MILE TO LOCKED GATE (YALE LOCK, EDISON KEY). CONTINUE ON PAVED ROAD 2.3 MILES TO CATTLE GUARD, CONTINUE 2.4 MILES TO ANOTHER CATTLE GUARD AND RANCH ENTRANCE. GO THROUGH GATE AHEAD AND LEFT, GOING UPHILL ON DIRT ROAD 1.4 MILES TO FORKS. TAKE LEFT FORK UPHILL 0.6 MILE TO LOCKED GATE (YALE LOCK, EDISON KEY). CONTINUE ON DIRT ROAD 0.3 MILE TO 3 FORKS. TAKE MIDDLE FORK 0.15 MILE UPHILL ALONG RIDGE TO TOP OF HILL AND STATION. HEIGHT OF LIGHT ABOVE STATION MARK 4 FEET. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--4-1/2 MILES NE OF YORBA LINDA
01/01/1973 by NGS (MONUMENTED)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1973 (JLC) THE STATION MARK, REFERENCE MARKS 5 AND 6, AND THE AZIMUTH MARK WERE RECOVERED IN GOOD CONDITION. ALL DISTANCES AND DIRECTIONS COMPARED FAVORABLY WITH PREVIOUS OBSERVATIONS WITH THE EXCEPTION OF THE DISTANCE TO REFERENCE MARK 6 WHICH WAS FOUND TO BE 0.08 FOOT AND 0.025 METER SHORTER. DUE TO CHANGES IN THE AREA, A COMPLETE NEW DESCRIPTION FOLLOWS. THE STATION IS LOCATED IN NE 1/4 SEC 17, T 3 S, R 8 W, ABOUT 3 MILES NORTH OF STATE HIGHWAY 91 (RIVERSIDE FREEWAY), 5 MILES EAST OF OLINDA, AND 6 MILES NORTHEAST OF YORBA LINDA. IT IS ON THE HIGHEST POINT OF THE SAN JUAN HILLS. THERE IS NO INFORMATION AS TO WHO OWNS THE PROPERTY AT THIS TIME, BUT WAS REPORTED TO BE OWNED BY THE RANCHO SANTA ANA IN 1963. TO REACH THE STATION FROM THE INTERSECTION OF STATE HIGHWAY 91 (RIVERSIDE FREEWAY) AND STATE HIGHWAY 90 (IMPERIAL HIGHWAY), GO NORTH ON STATE HIGHWAY 90 FOR 0.5 MILE TO A CROSSROAD. TURN RIGHT AND GO EAST ON ORANGETHROPE AVENUE FOR 2.75 MILES TO A SIDE ROAD ON THE LEFT AND A SMALL SIGN METROPOLITAN WATER DISTRICT OF SOUTHERN CALIFORNIA. TURN LEFT AND GO NORTH ON THE PAVED ROAD FOR 1.3 MILES TO A T-INTERSECTION AT THE TOP OF THE HILL. TURN LEFT AND GO WEST ON THE TRACK ROAD FOR 0.25 MILE TO A SIDE ROAD ON THE RIGHT. TURN SHARP RIGHT AND GO DOWNHILL AND THEN NORTH UPHILL FOR 0.55 MILE TO TWO STORAGE TANKS ON THE RIGHT. TURN RIGHT PASSING TO THE LEFT OF THE STORAGE TANKS AND GO EAST ON THE TRACK ROAD FOR 0.7 MILE TO A GATE. PASS THROUGH THE GATE AND CONTINUE EAST AND NORTH ON THE TRACK ROAD FOR 0.8 MILE TO A GATE. PASS THROUGH THE GATE AND CONTINUE NORTH ON THE TRACK ROAD FOR 0.15 MILE TO THE AZIMUTH MARK ON THE RIGHT. CONTINUE NORTH ON THE TRACK ROAD FOR 0.75 MILE TO A FORK. TAKE THE RIGHT FORK AND GO NORTH 0.15 MILE TO A DIM TRACK ROAD ON THE LEFT. TURN LEFT AND GO WEST UPHILL FOR 0.15 MILE TO THE HIGHEST POINT OF THE HILL AND THE STATION. THE STATION MARK IS A 1/2 INCH COPPER BOLT WITH A HOLE PUNCHED IN THE TOP. THE BOLT IS CEMENTED IN THE TOP OF A HEXAGON SHAPED PIER WHICH IS 2 FEET IN DIAMETER AND PROJECTS 3 FEET ABOVE THE SURFACE OF THE GROUND. IT HAS SAN JUAN 1896 CHISLED IN THE NORTH FACE OF THE PIER. REFERENCE MARK 5 IS A STANDARD DISK STAMPED SAN JUAN NO 5 1886, CEMENTED IN THE TOP OF A 12-INCH ROUND CONCRETE MONUMENT WHICH IS FLUSH WITH THE SURFACE OF THE GROUND. NOTE 11B REFERENCE MARK 6 IS A STANDARD DISK STAMPED SAN JUAN NO 6 1886, CEMENTED IN THE TOP OF A 12-INCH ROUND CONCRETE MONUMENT WHICH IS FLUSH WITH THE SURFACE OF THE GROUND. NOTE 11B THE AZIMUTH MARK IS A STANDARD DISK STAMPED SAN JUAN 1886, CEMENTED IN THE TOP OF A 10-INCH SQUARE CONCRETE MONUMENT WHICH PROJECTS 3 INCHES ABOVE THE SURFACE OF THE GROUND. IT IS 9 FEET SOUTH OF THE CENTER OF THE TRACK ROAD AND 2.2 FEET NORTH OF A METAL WITNESS POST WITH A SIGN ATTACHED. NOTE 16A HEIGHT OF LIGHT ABOVE STATION MARK 4.5 FEET. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--5 MILES EAST OF OLINDA
01/01/1976 by CADT (GOOD)
RECOVERY NOTE BY CALTRANS 1976 (ARA) THE STATION MARK, AZIMUTH MARK AND REFERENCE MARKS NO 5 AND NO 6 WERE RECOVERED IN GOOD CONDITION AS DESCRIBED BY J.L. COOK IN 1973.
01/01/1976 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 (PDC) STATION AND RMS 5 AND 6 WERE RECOVERED IN GOOD CONDITION AS DESCRIBED. AZIMUTH MARK NOT SEARCHED FOR. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN 4-1/2 MILES NE OF YORBA LINDA.
03/15/1988 by PSOMAS (GOOD)
RECOVERY NOTE BY PSOMAS AND ASSOCIATES 1988 THE STATION IS LOCATED IN THE EASTERN PORTION OF ORANGE COUNTY. TO REACH THE STATION FROM THE INTERSECTION OF STATE HIGHWAY 91 AND WIER CANYON ROAD IN THE CITY OF YORBA LINDA, GO NORTHERLY 1.3 MILES ALONG WIER CANYON ROAD AND YORBA LINDA BOULEVARD TO STONEHAVEN ROAD ON RIGHT, TURN RIGHT ONTO STONEHAVEN ROAD AND GO 0.6 MILE TO A DIRT ROAD ON RIGHT, TURN RIGHT ONTO ROAD AND GO 200 FEET UP HILL ON ROAD TO A GATE WITH A COUNTY, DAI, LOCK AND AN S.C. EDISON LOCK, CONTINUE THROUGH GATE AND ALONG DIRT ROAD FOR 0.5 MILE EASTERLY AND NORTHERLY TO A FORK IN THE ROAD AT AN OIL PUMP AND TWO STORAGE TANKS. TURN RIGHT AND GO EAST 0.5 MILE TO A GATE WITH AN S.C. EDISON AND COUNTY, DAI, LOCK. PASS THOUGH THE GATE AND CONTINUE ALONG ROAD FOR 0.7 MILE TO A GATE WITH S.C. EDISON AND COUNTY, DAI, LOCKS, PASS THROUGH GATE AND CONTINUE ALONG ROAD EASTERLY AND NORTHEASTERLY 1.1 MILES TO A DIRT ROAD ON THE LEFT, TURN LEFT AND GO WEST UPHILL FOR 0.15 MILE TO THE HIGHEST POINT AND STATION. THE STATION MARK IS A 1/2 INCH COPPER BOLT WITH A PUNCH HOLE SET IN A HEXAGONAL PIER 2 FEET IN DIAMETER AND PROJECTING 3 FEET ABOVE GROUND. SAN JUAN 1896 IS CHISELED INTO THE NORTH FACE OF THE PIER. REFERENCE MARK 5 IS A STANDARD DISK STAMPED --- SAN JUAN NO. 5 1896---, SET IN A 12 INCH CYLINRDICAL CONCRETE MONUMENT FLUSH WITH THE GROUND. RM 5 IS 38.98 FEET DISTANT FROM THE STATION. REFERENCE MARK 6 IS A STANDARD DISK STAMPED ---SAN JUAN NO. 6 1886---, SET IN A 12 INCH CYLINDRICAL CONCRETE MONUMENT FLUSH WITH THE GROUND . THE STATION IS 39.27 FEET FROM RM 6.
06/01/1992 by CA-059 (GOOD)
RECOVERY NOTE BY ORANGE COUNTY CALIFORNIA 1992 RECOVEREY NOTE AS DESCRIBED BY PSOMAS AND ASSOCIATES 1988 IS ADEQUATE. SOME OF THE LOCKS HAVE BEEN CHANGED OR REMOVED. TO OBTAIN ACCESS THROUGH GATES IN CHINO HILLS STATE PARK, CONTACT STATE OF CALIFORNIA, DEPARTMENT OF PARK AND RECREATION, CHINO HILLS DISTRICT, CHIEF RANGER BOB BIRKLAND AT (714) 349-1365 OR (714) 269-5204. $ TO OBTAIN INFORMATION REGARDING ACCESS TO A KEY FOR A DA1 LOCK, CONTACT COUNTY OF ORANGE SURVEY DIVISION AT (714) 567-6324 OR (714) 567-7856. $ THIS STATION WAS OCCUPIED AS PART OF A CALIFORNIA HPGN DENSIFICATION SURVEY.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in June 1996. The horizontal coordinates are valid at the epoch date displayed above. The epoch date for horizontal control is a decimal equivalence of Year/Month/Day.
  • The orthometric height was scaled from a topographic map.
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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