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Details for Benchmark: HL0429

N 37° 50.033 W 107° 43.450 (NAD 83)

Altitude: 9968.91

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

Location:
In SAN JUAN county, CO View Original Datasheet
Designation:
L 439
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Probably hold position/elevation well.

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Found about 30 feet from Me & Bucky's coords with a witness post.

[Photos:]
photoHL0429

Found in great shape!

[Photos:]
photobenchmark on way to Ouray
photoview from car

Found as described in good condition.

[Photos:]
photoHL0429 L439
N 37° 50.067 W 107° 43.475

Bench Mark L 439 was recovered as described, in good condition.

[Photos:]
photoHL0429 20060511 A3 W (San Juan Co. CO)
West at Bench Mark L 439.
photoHL0429 20060511 A2 E (San Juan Co. CO)
East at Bench Mark L 439.
photoHL0429 20060511 A1 N (San Juan Co. CO)
North at Bench Mark L 439.
photoHL0429 20060511 B (San Juan Co. CO)
Bench Mark L 439 from Eye Level.
photoHL0429 20060511 C (San Juan Co. CO)
Bench Mark L 439.
photoHL0429 20060511 G (San Juan Co. CO)
Bench Mark L 439 w/GPSr.

Documented History (by the NGS)

01/01/1985 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1985 6.4 KM (4.0 MI) NORTH FROM SILVERTON. 6.4 KM (4.0 MI) NORTHERLY ALONG U.S. HIGHWAY 550 FROM ITS JUNCTION WITH STATE HIGHWAY 110 IN SILVERTON, 0.5 KM (0.3 MI) NORTH OF MILEPOST 74, IN THE SOUTH END OF A 10- BY 24-FOOT EXPOSED AREA OF OUTCROPPING BEDROCK, 9.0 M (29.5 FT) EAST OF THE CENTERLINE OF THE HIGHWAY, 2.5 M (8.2 FT) NORTHWEST OF THE CENTER OF A TRACK ROAD, AND 0.5 M (1.6 FT) NORTH OF THE SOUTH END OF THE BEDROCK. THE MARK IS 0.3 METERS SE FROM A WITNESS POST THE MARK IS 1.3 M ABOVE THE HIGHWAY.
07/05/1991 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1991 (WLR) 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 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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