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Details for Benchmark: DW0221

N 33° 15.933 W 115° 59.800 (NAD 83)

Altitude: 14.36

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

Location:
In IMPERIAL county, CA View Original Datasheet
Designation:
IMP 7 SD CO
Marker Type:
survey disk
Setting:
copper-clad steel rod
Stability:
Probably hold position/elevation well.

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Another one found using jefj42's coordinates. Very close to the highway and quite visable.
The Fossillady

[Photos:]
photoDW0221
photoWitness post and BM
N 33° 15.905 W 115° 59.859

Found in fair condition, but over 100 yards west of listed coordinates.

[Photos:]
photoDW0221
photoView looking east

Documented History (by the NGS)

01/01/1968 by CA-073 (MONUMENTED)
DESCRIBED BY SAN DIEGO COUNTY CALIFORNIA 1968 2.2 MI W FROM SALTON CITY. 2.2 MILES WEST ALONG BORREGO-SALTON SEA WAY FROM U.S. HIGHWAY 86, 5.45 MILES EAST OF IMPERIAL COUNTY LINE, 300 FEET SOUTHWEST OF SECTION CORNER 26-25-36-36 T10S R9E AND 50 FEET NORTHWEST OF CENTER LINE OF BORREGO-SALTON SEA WAY. SET 8 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 IMP 7 1968. SET STEEL FENCE GUARD POST ONE FOOT NORTH OF MARK. T10S R9E 35.
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 2.2 MILES WEST ALONG COUNTY ROAD S22 (BORREGO SALTON SEAWAY) FROM THE JUNCTION OF STATE HIGHWAY 86, 5.45 MILES EAST OF THE SAN DIEGO COUNTY LINE, 1.5 MILES EAST OF THE JUNCTION OF TRUCKHAVEN TRAIL, 0.25 MILE WEST OF THE JUNCTION OF VERONICA AVENUE, LEADING NORTHEAST, 50.0 FT. NORTHWEST OF THE CENTER LINE OF THE ROAD, 300 FT. SOUTHWEST OF SECTION CORNER 26-25-35-36 TIGS R9E. THE DISK IS FLUSH WITH THE GROUND, INSIDE A 5-INCH CONCRETE PIPE.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (EEM) 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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