Vertical Control Mark P 510 - Coulee Dam, WA
Posted by: Groundspeak Premium Member T0SHEA
N 47° 57.270 W 118° 59.394
11T E 351434 N 5313160
Just across Highway 155 from Grand Coulee Dam, P 510 is at the base of a tall rock cut.
Waymark Code: WMYCWD
Location: Washington, United States
Date Posted: 05/30/2018
Published By:Groundspeak Premium Member Ernmark
Views: 1
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It's not easy to park nearby without getting chastised by the security guards at the dam (experience talking). There is a pullout with parking about 800 feet up hill and another about 1800 feet downhill.

The marker is about 100 feet south of the light standard at the south edge of the steel tracks which run across the road and into the dam site. It is set in the top of a small ledge about 2 feet in height, beside a witness post on the west side of the highway.

STATION DESCRIPTION
DESCRIBED BY NATIONAL GEODETIC SURVEY 1981

DESIGNATION -  P 510
PID         -  SW1022
STATE/COUNTY-  WA/GRANT
COUNTRY     -  US
USGS QUAD   -  GRAND COULEE DAM (1989)
MARKER: DV = VERTICAL CONTROL DISK
SETTING: 66 = SET IN ROCK OUTCROP
STAMPING: P 510 1981
MARK LOGO: NGS

DESCRIBED BY NATIONAL GEODETIC SURVEY 1981
IN GRAND COULEE.
AT THE WEST END OF GRAND COULEE DAM, IN TOP OF THE EAST EDGE OF A 4 BY 5 FOOT FLAT TOP SHELF IN A GRANITE CUT, 37.7 METERS (123.5 FT) SOUTH OF THE EXTENDED CENTERLINE OF THE ROAD LEADING OVER THE DAM, 5.8 METERS (19 FT) WEST OF THE WEST CURB OF THE HIGHWAY, 31.2 METERS (102 FT) SOUTH OF THE SOUTH CONCRETE RETAINING WALL OF A CRANE BAY ON THE WEST AXIS OF THE DAM, 10 METERS (33 FT) NORTH OF THE SOUTH EDGE OF A CONCRETE APRON AT THE BASE OF THE CUT, 0.6 METER (2 FT) WEST OF THE WEST EDGE OF THE ROCK SHELF.
THE MARK IS 0.3 METERS E FROM A WITNESS POST.
From the NGS Datasheet
Condition: Mark found in good condition

Designation: P 510 1981

Benchmark Agency: National Geodetic Survey

Monumentation type: Vertical Control Mark

County: WA/GRANT

USGS 7.5' Topographic Quadrangle Name (optional): GRAND COULEE DAM

Find type: Coordinates and/or to-reach information from the NGS database (or Geocaching's copy of it) were used

Web address of this benchmark's datasheet (optional): [Web Link]

NGS PID: SW1022

Benchmark Agency (if other): Not listed

Monumentation type (if other): Not listed

Special category (optional): Not listed

Special Category (if other): Not listed

Local database's URL (optional): Not listed
Visit Instructions:
  1. A closeup photo of the mark taken by you is required.
  2. A 'distant' photo including the mark in the view is highly recommended. Include the compass direction you faced when you took the picture.
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