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Details for Benchmark: GR1549

N 36° 01.529 W 114° 08.241 (NAD 83)

Altitude: 1239

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

Location:
In MOHAVE county, AZ View Original Datasheet
Designation:
A 59
Marker Type:
triangulation station disk
Setting:
in a boulder
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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POOR condition. Slope has been undercut by wave action and is slumping.

[This entry was edited by kayakbird on Sunday, February 21, 2010 at 4:04:35 PM.]

[Photos:]
photoGR1549 A 59 1948
photoGR1549 SLUMP CRACK
ANOTHER ONE FURTHER UPHILL
photoGR1549 NE

Documented History (by the NGS)

01/01/1948 by USGS (MONUMENTED)
DESCRIBED BY US GEOLOGICAL SURVEY 1948 LOCATED ABOUT 0.7 MI E. OF N.P.S. LIGHT BASE ON ROCKY POINT. ABOUT 50 FT. S. OF HIGH WATER MARK AT NORTH END OF SMALL RIDGE, ABOUT 20 FT. ABOVE HIGH WATER MARK. TO REACH NOT GIVEN. STATION MARK--STANDARD TABLET STAMPED---A59 1948---, CEMENTED IN TOP OF BOULDER IN PLACE. RMS--NONE SET.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in August 1993.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)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.

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