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Details for Benchmark: SV1449

N 47° 43.204 W 116° 19.718 (NAD 83)

Altitude: 4936

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

Location:
In SHOSHONE county, ID View Original Datasheet
Designation:
HEMLOCK
Marker Type:
survey disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

Reference Points

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Documented History (by the NGS)

01/01/1938 by USGS (MONUMENTED)
DESCRIBED BY US GEOLOGICAL SURVEY 1938 LOCATED ABOUT 3 MI. N. AND 21.2 MI. E. OF COEUR D ALENE, IN THE SE. 1/4 OF SEC. 23, T 51 N, R 1 E, ON THE HIGHEST POINT OF A PROMINENT KNOLL KNOWN AS --HEMLOCK PEAK--. TO REACH FROM TEPEE SUMMIT, DRIVE S. ON THE TEPEE SUMMIT-BUMBLEBEE RD. FOR 4 MI. TO U.S. FOREST SERVICE SIGN --HEMLOCK--, TAKE RD. TO HEMLOCK FOR 2 MI. TO STATION. STATION MARK--STANDARD TABLET STAMPED---HEMLOCK 1938---, CENTERED IN ROCK IN PLACE UNDER CENTER OF DESTROYED L.O.T. REFERENCE MARK NO. 1--STANDARD REFERENCE MARK TABLET STAMPED---NO 1 1938---, CEMENTED IN ROCK, 18.70 FT. FROM STATION MARK, N 27 DEG 54 MIN E. REFERENCE MARK NO. 2--STANDARD REFERENCE MARK TABLET STAMPED---NO 2 1938---, CEMENTED IN ROCK, 32.9 FT. FROM STATION MARK, S 42 DEG 42 MIN E.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in July 1992.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.