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Details for Benchmark: AD9483

N 33° 49.767 W 117° 27.583 (NAD 83)

Altitude: 1378.94

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

Location:
In RIVERSIDE county, CA View Original Datasheet
Designation:
LM 51
Marker Type:
bench mark disk
Setting:
in a boulder
Stability:
Probably hold position/elevation well.

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Found it with Team Geo-Clarks

[Photos:]
photoAD9483
photoAD9483-1

Easy find

[Photos:]
photoAD9483

Thanks to cyrano58 I found this at his coords. documented coord are off by 300 ft

[Photos:]
photoAD9483

Coordinates a bit off 33 49.746 117 27.488

Recovered as described. Watch out for rattlers in these rocks! I was "rattled at" twice, but didn't see either one, as they were under / between rocks. Step carefully, with eyes wide open! One of my more nerve-wracking recoveries!

[This entry was edited by Klemmer & TeddyBearMama on Sunday, March 18, 2007 at 11:15:08 AM.]

[Photos:]
photoAD9483 Disc near Lake Matthews, CA
photoAD9483 Area near Lake Matthews, CA
photoView South from AD9483 near Lake Matthews
A good view of "Rattler Rocks", and the nearby dry hills.

Found it along with 4 others in the area.
Correct cords. N33 49.747 W117 27.492

Documented History (by the NGS)

01/01/1995 by MWDSC (MONUMENTED)
DESCRIBED BY METRO WATER DISTR SO. CALIFORNIA 1995 (DEL) FROM 91 FRWY GO SOUTH ON LA SIERRA AVE TO CAJALCO ROAD. EAST ON CAJALCO ROAD APPROXIMATELY 0.1 MILE (0.2 KM). A STANDARD MWDSC 3 INCH BRASS DISK STAMPED LM 51 1995 SET FLUSH IN TOP OF A LARGE BOULDER LOCATED 63 FEET (19.2 M) NORTHERLY OF CENTERLINE OF CAJALCO ROAD AND 9.3 FEET (2.8 M) SOUTHERLY OF 6 FOOT (1.8 M) CHAIN LINK FENCE WITH 3 STRAND BARB WIRE ON TOP. A CARSONITE POST 3.7 FEET (1.1 M) NORTH. REF MWD FB 2513 02 071.

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 August 1997.
  • 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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