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Details for Benchmark: EV2593

N 34° 15.767 W 117° 50.667 (NAD 83)

Altitude: 2277.65

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

Location:
In LOS ANGELES county, CA View Original Datasheet
Designation:
R 115
Marker Type:
survey disk
Setting:
in a boulder
Stability:
May hold, but of type commonly subject to surface motion.

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N 33° 15.762 W 117° 50.661

Started at the gates where the San Gabriel River Road is [i]still[/i] closed. Sure wish they would open it. Walked up the closed road (kind of weird) for about a half mile to the mark. Location is as described.

[This entry was edited by Klemmer & TeddyBearMama on Sunday, May 04, 2008 at 8:10:47 PM.]

[Photos:]
photoEV2593 Disc in the San Gabriel Canyon, CA
photoEV2593 Disc with GPS
photoEV2593 area, showing the granite boulder
photoLooking from the mark to the Northeast
Based on an azimuth taken from the mark, plotted back home on a USGS Topo, I believe the largest peak is Mt. Baden-Powell, named after the founder of the Boy Scouts. Been up there a couple times. Nice hike to the top at about 9,400 feet.

Found while geocaching with Mountain Lovers, Just Daisy, and Bugholio. Disk is in great shape.

Spotted this benchmark while heading over to Never Find the Body Cache. It's in great condition.

[Photos:]
photoR 115 - On Driveway Down!!

Documented History (by the NGS)

01/01/1929 by USGS (MONUMENTED)
01/01/1971 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 14.6 MI N FROM AZUSA. 14.65 MILES NORTH ALONG STATE HIGHWAY 39 FROM THE ATCHISON, TOPEKA AND SANTA FE RAILWAY STATION AT AZUSA, AT THE Y JUNCTION OF A ASPHALT ROAD EAST AND SOUTH TO LOWER BICHOTA CANYON, 98.5 FEET EAST OF AND ACROSS THE ROAD FROM THE CENTER OF THE HIGHWAY, 143 FEET SOUTH-SOUTHEAST OF THE CENTER OF A STEEL GATE ACROSS THE ROAD, 9 FEET EAST OF THE CENTER OF THE ASPHALT ROAD, IN THE TOP OF A 2 BY 5 FOOT EMBEDDED GRANITE BOULDER WHICH IS PROJECTING 1 FOOT, 4.1 FEET WEST OF A WITNESS POST AND ABOUT 25 FEET LOWER THAN THE HIGHWAY AND 1 FOOT HIGHER THAN THE ASPHALT ROAD.
01/01/1977 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 RECOVERED IN GOOD CONDITION.
01/01/1983 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1983 RECOVERED IN GOOD CONDITION.
01/01/1984 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984 RECOVERED IN GOOD CONDITION.
01/01/1985 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1985 RECOVERED IN GOOD CONDITION.
01/01/1986 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1986 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in February 1993. * This is a READJUSTED BENCH MARK height. Code A indicates a distribution rate of 0.0 thru 1.0 mm/km. The height was derived from older observations constrained to new heights in a crustal motion area. The height is approximate in relation to other heights in its vicinity.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (G = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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