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Details for Benchmark: HL0433

N 37° 52.180 W 107° 43.382 (NAD 83)

Altitude: 10242.34

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

Location:
In SAN JUAN county, CO View Original Datasheet
Designation:
Z 439
Marker Type:
bench mark disk
Setting:
in a boulder
Stability:
May hold, but of type commonly subject to surface motion.

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Found at posted coords with a witness post.

[Photos:]
photoHl0433

Found as described in good condition.

[Photos:]
photoHL0433 Z 439

found with tigerman

witness post made this one fairly easy to find

Documented History (by the NGS)

01/01/1985 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1985 10.4 KM (6.45 MI) NORTH FROM SILVERTON. 10.4 KM (6.45 MI) NORTHERLY ALONG U.S. HIGHWAY 550 FROM ITS JUNCTION WITH STATE HIGHWAY 110 IN SILVERTON, NEAR THE CENTER OF THE SOUTHERN HALF OF A 6- BY 10-FOOT EXPOSED AREA OF BEDROCK IN A HIGHWAY CUT, 0.5 KM (0.3 MI) SOUTH OF MILEPOST 77, AND 12.4 M (40.7 FT) EAST OF THE CENTERLINE OF THE NORTHBOUND LANES OF THE HIGHWAY. THE MARK IS 0.3 METERS W FROM A WITNESS POST THE MARK IS 1.5 M ABOVE THE HIGHWAY.
07/06/1991 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1991 (WLR) RECOVERED IN GOOD CONDITION.
07/15/1998 by CODOT (GOOD)
RECOVERY NOTE BY COLORADO DEPARTMENT OF TRANSPORTATION 1998 (RSC) THE STATION IS LOCATED ABOUT 11 MI (17.7 KM) SOUTH OF OURAY, 5 MI (8.0 KM) NORTH-NORTHWEST OF SILVERTON AND 3 MI (4.8 KM) SOUTH OF RED MOUNTAIN PASS, AT U. S. HIGHWAY 550 MILEPOST 76.75. OWNERSHIP--COLORADO DEPT. OF TRANSPORTATION RIGHT-OF-WAY TO REACH THE STATION FROM THE INTERSECTION OF STATE HIGHWAY 110 AND U. S. HIGHWAY 550 IN SILVERTON, GO NORTHERLY FOR 6.45 MI (10.38 KM) TO THE STATION ON THE RIGHT IN THE MIDDLE OF A LARGE ROADCUT THE MARK IS A STANDARD DISK SET INTO THE TOP OF A LARGE BROWN BOULDER MEASURING 2.3 M (7.5 FT) BY 1.5 M.IT IS 15.2 M (49.9 FT) EAST FROM THE CENTER LINE OF U. S. HIGHWAY 550, 1.4 M (4.6 FT) NORTHWEST FROM A WITNESS POST AND ABOUT 1.4 M (4.6 FT) ABOVE THE HIGHWAY.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in March 1999.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • 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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