Details for Benchmark: DX0469
N 33° 16.750 W 116° 17.933 (NAD 83)
Coordinates may not be exact. Altitude is READJUSTED and location is SCALED. (more info)
- In SAN DIEGO county, CA View Original Datasheet
- CL 33
- Marker Type:
- bench mark disk
- copper-clad steel rod
- Probably hold position/elevation well.
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Documented History (by the NGS)
|01/01/1968 by CA-073 (MONUMENTED)
|DESCRIBED BY SAN DIEGO COUNTY CALIFORNIA 1968
1.1 MI S FROM BORREGO SPRINGS. 1.1 MILES SOUTH ALONG PEG LEG ROAD FROM THE INTERSECTION OF HENDERSON CANYON ROAD AND BORREGO-SALTON SEA WAY, FROM THE BORREGO SCHOOL 2.75 MILES EAST ON PALM CANYON ROAD. THENCE 1.25 MILES NORTH ON PEG LEG ROAD, 200 FEET SOUTH OF CORNER POWER POLE 570241. 35 FEET WEST OF CENTER LINE OF ROAD. SET 32 FEET OF 5/8 INCH COPPER-STEEL ROD DRIVEN TO REFUSAL AND CAPPED WITH THREADED SAN DIEGO COUNTY STANDARD DISK FLUSH WITH GROUND AND STAMPED CL 33 1969. SET STEEL FENCE GUARD POST 2 FEET NORTH OF MARK. T10S R6E 25.
|01/01/1970 by CA-073 (GOOD)
|RECOVERY NOTE BY SAN DIEGO COUNTY CALIFORNIA 1970
RECOVERED IN GOOD CONDITION.
|01/01/1978 by NGS (GOOD)
|RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
4.2 MILES NORTHEAST ALONG COUNTY ROAD S 22 FROM THE BORREGO ELEMENTARY SCHOOL AT BORREGO SPRINGS, THE CONCRETE COLLAR HAS BEEN ERODED AND HAS SLID DOWN THE ROD ABOUT 1 FT., THE ROD AND DISK ARE INTACT.
|03/30/1995 by USPSQD (POOR)
|RECOVERY NOTE BY US POWER SQUADRON 1995
MARK RECOVERED IN POOR CONDITION.
- 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.