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Details for Benchmark: HL0646

N 37° 47.977 W 107° 40.446 (NAD 83)

Altitude: 9604

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

Location:
In SAN JUAN county, CO View Original Datasheet
Designation:
V T
Marker Type:
horizontal control disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

Reference Points

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Found this one while geocaching.

Found on my way to grand junction

Documented History (by the NGS)

01/01/1952 by USGS (MONUMENTED)
DESCRIBED BY US GEOLOGICAL SURVEY 1952 STATION IS LOCATED ABOUT 1.0 MI. SSW. OF SILVERTON, COLORADO, AND 205 FT. E. OF HIGHWAY, ON THE HIGHEST POINT OF A SMALL KNOLL. TO REACH FROM THE POST OFFICE AT SILVERTON, DRIVE S. ALONG HIGHWAY 550 FOR 1.9 MI. TO WIDE GRADUAL CURVE AND STATION SITE. STATION MARK--STANDARD TABLET, STAMPED ---V.T. 1952 VABM 9598---, CEMENTED IN GRANITE OUTCROP. REFERENCE MARKS--NONE.
01/01/1952 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1952 RECOVERED IN GOOD CONDITION.
06/28/1991 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1991 STATION IS LOCATED ABOUT 1.5 KM (0.9 MI) SOUTHWEST OF SILVERTON, IN THE SAN JUAN NATIONAL FOREST, 1 KM (0.6 MI) SOUTHEAST OF A HAIRPIN HIGHWAY CURVE, JUST OFF US HIGHWAY 550, IN THE MIDDLE OF A SLOPING NORTHWEST-SOUTHEAST RIDGE THAT PARALLELS THE HIGHWAY AND IS ON THE EAST SLOPE OF SULTAN MOUNTAIN. OWNERSHIP--US FOREST SERVICE. TO REACH FROM THE JUNCTION OF US HIGHWAY 550 AND STATE HIGHWAY 110 AT THE SOUTHWEST END OF A LARGE TRAFFIC TRIANGLE JUST SOUTHWEST OF SILVERTON, GO SOUTHWEST ON HIGHWAY 550 FOR 0.75 MI (1.21 KM) TO A TRACK ROAD AND GATE ON THE RIGHT JUST PAST A HAIRPIN CURVE. CONTINUE UPGRADE FOR 0.35 MI (0.56 KM) TO A NARROW TURNOUT ON THE LEFT OPPOSITE A BROKEN ROCK FACE AND THE END OF TRUCK TRAVEL. CONTINUE UPHILL FOR 0.9 MI (1.4 KM) TO A TURNOUT ON THE LEFT AND ENOUGH ROOM TO TURN AROUND. PACK DOWN INTO RAVINE, THEN RIGHT, SOUTHEAST, FOR 150 FT (45.7 M) , THEN LEFT, EASTERLY, UP SIDE OF RIDGE FOR 150 FT (45.7 M) TO STATION. NOTE--300 FT PACK TO STATION. STATION MARK PROJECTS 5 MM FROM A DRILL HOLE IN A 1 M (3.3 FT) X 2.6 M (8.5 FT) X 0.1 M (0.3 FT) HIGH ROCK OUTCROP ABOUT 60 M (196.8 FT) NORTHWEST OF HIGH GROUND. IT IS ABOUT 100 M (328.1 FT) NORTHEAST OF, AND 5 M (16.4 FT) HIGHER THAN THE HIGHWAY, 150 M (492.1 FT) EAST OF THE TURNOUT, 0.9 M (3.0 FT) WEST OF A FIBERGLASS WITNESS POST, 7.8 M (25.6 FT) WEST-SOUTHWEST OF A 40-CM SPRUCE TREE, 6.0 M (19.7 FT) NORTHWEST OF THE NORTHWEST AND HIGHEST END OF A 1 M (3.3 FT) X 1 M (3.3 FT) X 0.5 M (1.6 FT) HIGH BOULDER SITTING ON TOP OF THE GROUND. DESCRIBED BY G.R.HEID
07/08/1993 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1993 (RSC) RECOVERED AS DESCRIBED.
07/15/1998 by CODOT (GOOD)
RECOVERY NOTE BY COLORADO DEPARTMENT OF TRANSPORTATION 1998 (RSC) RECOVERED AS DESCRIBED.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in May 1992.
  • The orthometric height was determined by GPS observations and a high-resolution geoid model.
  • 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.

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