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Details for Benchmark: DX2620

N 33° 58.000 W 117° 09.533 (NAD 83)

Altitude: 2173.1

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

Location:
In RIVERSIDE county, CA View Original Datasheet
Designation:
B 447
Marker Type:
bench mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Must Read!

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Out caching today with Ragfoot and Dillweed trying to get our 25 benchmarks in a day to qualify for a challenge.

#10 of 25 benchmarks found today with friends.

10th of 25 benchmarks found with fisnjack and dillweed today as we tried to avoid the raindrops.

Found while caching with goldennuggetz, Team Geo-Clarks, Supercheeseburger, and RoxieMama.
T4TC!

Found BM with goldennuggetz, Team geo-Clarks, Supercheeseburger, and ParkerSaru while geocaching and benchmarking in Mo Valley Area.

Found with Team Geo-Clarks, Supercheeseburger, RoxieMama and ParkerSaru.

Easy find. No need to post same photos.

Recovered benchmark in Good condition. Description adequate. Followed previous finder's coordinates.

[Photos:]
photoDX2620 (Small)
photoDX2620-1 (Small)
photoDX2620-2 (Small)
Looking East to new Redland's Road.
N 33° 58.073 W 117° 09.545

Well, this was an interesting find! After finding DX2627, I continued up to the plateau and looked around it carefully for any signs of benchmarks. Nope. Looked over the edge of a steep bank (almost a cliff really), and saw an isolated section of old asphalt road down below, and right there, from about 100 ft up, I could see a benchmark in the typical monument! Gotta get down there! Hmmm.... by myself, didn't bring my pack with water, or my poles, from the Jeep. No easy way down from here. OK, I can maybe park further north on the road, and the walk up the dry arroyo... OK. Did that. Properly equipped now. Went up there, slogged thru the $%^&* thistle, found the mark. I was quite surprised to see that it had been logged previously. No pics before though.

This area is historically interesting from the benchmark standpoint. I finally realized there USED TO be a long winding, switchbacking road up the grade, and down the other side. Then, a new road was build replacing the old one with an almost straight shot, cut down through the hilltop. Lots of dirt moved. So - the old bechmarks, if they weren't trashed with the dirt, now sit next to isolated sections of the old road, like this one. The descriptions of the old marks talk about "sharp bends" and ""turn backs". Not on the new road! I gotta get back up here again after researching some old maps.

[Photos:]
photoDX2620 in Riverside County CA
View from up on top of the bank. This is 3X zoom on the camera. I should have taken one unzoomed.
photoDX2620 in Riverside County CA
Disc closeup
photoDX2620 in Riverside County CA
This shows the isolated section of the old switchbacking road
photoDX2620 in Riverside County CA
This is a view down toward the new road. Be very careful parking down there, not much room on the shoulder.
photoNear DX2620 in Riverside County CA
Interesting "artifact" near the mark. Around late 50's TV chassis (I used to work on them with my dad when I was a kid). Evidently it has been through a fire, and then used for target practice. Only the aluminum cased electrolytic capacitors (ahhh.. "condensors" was the term in those days!) survived corrosion fairly well. Hmmm... if I could date it, that would put a bound on when the road was re-built... no one would have carried it up here!

Found on the way back down from Woody_k's cache.

Found this benchmark on the way back from placing a cache. Had I known this one wasn't found in 1974 I would have taken some coordinates.

Documented History (by the NGS)

01/01/1949 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1949 3.4 MI S FROM ORDWAY. 1.5 MILES SOUTHEAST ALONG THE SOUTHERN PACIFIC RAILROAD FROM THE STATION SIGN ORDWAY, THENCE 1.9 MILES SOUTH ALONG REDLANDS BOULEVARD, 140.9 FEET WEST OF B.M. A 447, ABOUT THE MIDDLE OF TWO SHARP CURVES, 12.9 FEET NORTH OF THE CENTER LINE OF THE BOULEVARD, ABOUT LEVEL WITH THE BOULEVARD, AND SET IN THE TOP OF A CONCRETE POST FLUSH WITH THE GROUND.
01/01/1974 by USGS (MARK NOT FOUND)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1974 MARK NOT FOUND.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • 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 geoid height was determined by GEOID99.

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