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Details for Benchmark: DX4661

N 33° 54.006 W 117° 45.177 (NAD 83)

Altitude: 1130.6

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

Location:
In ORANGE county, CA View Original Datasheet
Designation:
3 8 19
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

Must Read!

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Came up today with MerryMary to check on waypoint 4 of my now defunct Matrix Decoded geoache series -- the Freeway Complex Fire of November 15, 2008 burned nearly 95% of Chino Hills State Park. Needless to say the ammo can was "toast!" At one time I had explored downhill from the powerline towers along what appeared to be an animal trail, but gave up after only a few hundred yards due to the heavy brush. We had always wondered what it was like up here, though, and since the fires burned through everything, there was nothing stopping us from returning along the low sloping ridgeline back to our starting point. We headed south and west from the tower and soon encountered a hillock overlooking the immediate area. I noticed the metal rod in the ground, walked on over, and spotted the survey marker about 4 feet away. The walk was simple today compared to that reported back in 2006 by my good geocache/hiking buddy Klemmer. With everything burned, no bushwhacking at all was required. It's almost like a moonscape up there...

[Photos:]
photoThe marker...
photo95% of CHSP now looks similar to this...
photo...and this...
photo...and this :-(
photoThe remains of the day...
...what's left of the ammo can/contents at the final waypoint of my Matrix Decoded series geocache.

Quite an adventure getting here (and back)! Some advance mapping showed the closest trail was at the end of a high voltage power tower access road, and then cross country down to the second hill to the mark. Not bad, some coyote trails. Some bushwhacking to get to the mark. Then, how to get down? Back UP the same way? Nah! Followed some more deer / coyote trails down to the south, and ran out of options. Some VERY TOUGH, very tangled vegetation to get thru. Wished for a machette! Wish I had gone further west before starting down, or not gone up there at all. Hardest bushwhacking I have ever done, and I've done a good bit around the world!

[Photos:]
photoDX4661 in Orange County, CA
Disc closeup
photoDX4661 in Orange County, CA
Look about 4 feet in front of the witness post
photoDX4661 in Orange County, CA
Monument

Documented History (by the NGS)

1/1/1965 by CA-059 (MONUMENTED)
DESCRIBED BY ORANGE COUNTY CALIFORNIA 1965 (JS) EAST ON ESPERANZA STREET FROM IMPERIAL HIGHWAY 2.6 MILES TO A GATE AT THE ENTRANCE TO A PAVED ROAD, UP HILL TO THE LEFT (NO KEYS REQUIRED), THROUGH GATE 1.0 MILE TO A DIRT ROAD TO THE LEFT, 0.5 MILE ON THE DIRT ROAD TO U TURN TO THE RIGHT, 0.2 MILE DOWN THE NORTH SIDE OF THE HILL TO THE HORSE-SHOE TURN TO THE LEFT AT THE BOTTOM OF THE VALLEY, 0.3 MILE UP THE SOUTH SIDE OF THE HILL TO U TURN TO THE RIGHT ON TOP OF A HILL, 0.65 MILE UP HILL PAST OIL WELL A.V.W.C. 1 ON TWO OIL STORAGE TANKS TO A WOVEN WIRE GATE (ORANGE COUNTY SURVEYORS LOCK) THROUGH THE GATE 0.75 MILE TO A WOVEN WIRE GATE THROUGH GATE 0.1 MILE TO Y IN THE ROAD, TAKE U TURN TO THE LEFT, 0.45 MILE TO WOVEN WIRE GATE (NO LOCK) THROUGH THE GATE, 0.05 MILE TO Y IN THE ROAD, TAKE RIGHT LEG 0.05 MILE TO BARBED WIRE GATE (NO LOCK), THROUGH GATE 0.45 MILE ALONG THE DIRT ROAD TO THE TOP OF THE LAST HILL TO STATION 3-8-19. ORANGE COUNTY SURVEYORS BRASS CAP MARK 3-8-19.

Control Text

  • The horizontal coordinates were established by classical geodetic methods 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 NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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