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Details for Benchmark: DX2721

N 33° 58.867 W 117° 07.617 (NAD 83)

Altitude: 1798.18

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

Location:
In RIVERSIDE county, CA View Original Datasheet
Designation:
Z 448
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.

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Easy find along San Timoteo Road.

[Photos:]
photoDX2721 in Riverside County CA
Disc closeup
photoDX2721 in Riverside County CA
Mark area
N 33° 58.887 W 117° 07.602

Easy find because there was a wooden stake right next to the mark. Mark is in good condition.

[Photos:]
photoDX2721

Documented History (by the NGS)

01/01/1949 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1949 0.3 MI W FROM EL CASCO. 0.3 MILE WEST ALONG THE SOUTHERN PACIFIC CO. RAILROAD FROM THE FORMER STATION AT EL CASCO, AT A POINT WHERE THE ROAD AND RAILROAD SEPERATE, 67 1/2 FEET WEST OF THE CENTER LINE OF A FARM ROAD CROSSING, 38.2 FEET NORTH OF THE CENTER LINE OF SAN TIMOTEO CANYON ROAD, 29.2 FEET SOUTH OF THE SOUTH RAIL OF THE MAIN TRACK, 2 1/2 FEET SOUTH OF A TELEPHONE POLE, 2.2 FEET NORTH OF A WITNESS POST, ABOUT LEVEL WITH THE TRACK, AND SET IN THE TOP OF A CONCRETE POST PROJECTING 0.4 FOOT ABOVE THE GROUND.
01/01/1958 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1958 RECOVERED IN GOOD CONDITION.
12/03/1992 by MWDSC (GOOD)
RECOVERY NOTE BY METRO WATER DISTR SO. CALIFORNIA 1992 BEAUMONT, 7.5 MILES (12.1 KM) WESTERLY ALONG SAN TIMOTEO CANYON RD FROM THE INTERSECTION WITH INTERSTATE 10, 38.2 FEET (11.6 M) NORTH OF THE CENTERLINE OF SAN TIMOTEO CANYON RD., 29.2 FEET (8.9 M) SOUTH OF THE SOUTH RAIL OF THE MAIN TRACK, 3 FEET (0.9 M) WEST OF A POWER POLE WITH NO NUMBER, ABOUT LEVEL WITH THE TRACKS, IN TOP OF A CONCRETE POST POST 1 FOOT (0.3 M) ABOVE THE GROUND.

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 May 1994.
  • 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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