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Details for Benchmark: JL0030

N 38° 50.283 W 106° 07.733 (NAD 83)

Altitude: 7943.47

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

Location:
In CHAFFEE county, CO View Original Datasheet
Designation:
H 5
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Found in fair condition as described.Can barely read the H in designation,has been beaten on but still there.

[Photos:]
photoJL0030 H 5
photoTHE ROCK IT'S SET IN
N 38° 50.328 W 106° 07.768

FOUND IN GOOD CONDITION. GRAVEL ROAD IS NOW A PAVED ROAD.

[Photos:]
photoJL0030 CLOSEUP
photoJL0030 BOULDER, BUENA VISTA, COLORADO
WESTVIEW FROM ROADWAY TOWARDS BOULDER.
photoJL0030 WESTVIEW
VIEW FROM ROADWAY TOWARDS BOULDER.

Documented History (by the NGS)

01/01/1925 by CGS (MONUMENTED)
01/01/1953 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1953 0.25 MI SE FROM BUENA VISTA. 0.25 MILE SOUTHEAST ALONG THE DENVER AND RIO GRANDE WESTERN RAILROAD FROM THE STATION AT BUENA VISTA, 50 FEET NORTH OF SEMAPHORE 240.3, 83 FEET SOUTHWEST OF THE CENTER LINE OF A GRAVELED ROAD, 38.5 FEET NORTHEAST OF THE NORTHEAST RAIL OF THE MAIN TRACK, 17 FEET SOUTHWEST OF A ROW OF TELEPHONE POLES, 4 FEET ABOVE THE GROUND, 5 FEET BELOW THE TOP OF THE RAILS, SET IN THE TOP OF A 7X9 FOOT GRANITE OUTCROP.

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 June 1991.
  • 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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