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Details for Benchmark: SX1327

N 47° 24.849 W 121° 50.504 (NAD 83)

Altitude: 2164

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

Location:
In KING county, WA View Original Datasheet
Designation:
LOOKOUT RM 2
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
Most reliable and expected to hold position/elevation well.

Reference Points

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Documented History (by the NGS)

01/01/1973 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 (JLC) THE STATION IS ABOUT 6 MILES SOUTH-SOUTHWEST OF NORTH BEND, 3 MILES WEST-SOUTHWEST OF CEDAR FALLS, IN THE NW 1/4 SECTION 7, T 22 N, R 8 E AND ON PROPERTY OF THE SEATTLE WATER DEPARTMENT. TO REACH THE STATION FROM THE RAILROAD DEPOT IN CEDAR FALLS, GO SOUTH FOR 0.2 MILE TO A SIDE ROAD ON THE RIGHT. (THIS IS ABOUT 0.1 MILE NORTH OF THE SEATTLE WATER DEPARTMENT OFFICE). TURN RIGHT FOR 0.05 MILE TO A GATE, PASS THROUGH THE GATE AND TURN LEFT AND GO SOUTHERLY ON GRAVELED ROAD FOR 0.7 MILE TO A FORK. TAKE THE RIGHT FORK AND GO SOUTHERLY FOR 0.1 MILE TO A RAILROAD CROSSING, CONTINUE SOUTHERLY ON GRAVELED ROAD FOR 0.9 MILE TO A SIDE ROAD ON THE RIGHT AND SIGN CEDAR POINT LOOKOUT AND ROAD 20. TURN RIGHT AND GO WESTERLY ON ROAD 20 FOR 0.2 MILE TO A SIDE ROAD ON THE RIGHT, TURN RIGHT AND CONTINUE NORTHERLY ON ROAD 20 FOR 1.15 MILES TO A SIDE ROAD ON THE LEFT AND SIGN CEDAR POINT LOOKOUT AND ROAD 23. TURN LEFT AND GO WESTERLY ON ROAD 23 FOR 0.75 MILES TO THE CEDAR POINT LOOKOUT TOWER AND THE STATION. STATION MARK IS A STANDARD REFERENCE MARK DISK, STAMPED LOOKOUT NO 2 1973, CEMENTED IN DRILL HOLE IN BEDROCK THAT IS 12 INCHES BELOW THE GROUND SURFACE. IT IS 31.9 FEET NORTHWEST OF THE NORTHWEST LEG OF THE LOOKOUT TOWER, 23.6 FEET NORTHEAST OF THE NORTHEAST CORNER OF A RED BLOCK BUILDING AND 36.5 FEET NORTHWEST OF THE NORTHEAST LEG OF THE LOOKOUT TOWER. LOOKOUT 1937 IS A STANDARD DISK, STAMPED LOOKOUT 1937 KING CO. AEIAL, CEMENTED IN A DRILL HOLE IN BEDROCK THAT IS FLUSH WITH THE GROUND. IT IS 31.0 FEET NORTHEAST OF THE APPROXIMATE CENTER OF A TRACK ROAD, 15.3 FEET SOUTHEAST OF THE NORTHEAST CORNER OF A SMALL TIN BUILDING AND 4.4 FEET WEST OF THE NORTHWEST LEG OF THE LOOKOUT TOWER REFERENCE MARK 3 IS A STANDARD DISK, STAMPED LOOKOUT 1937 NO 3 1973, SET IN THE TOP OF A 12-INCH CYLINDRICAL CONCRETE MONUMENT THAT PROJECTS 4 INCHES. IT IS 43.3 FEET NORTHWEST OF THE SOUTHEAST LEG OF THE LOOKOUT TOWER, 32.0 FEET NORTHWEST OF THE APPROXIMATE CENTER OF TRACK ROAD AND 37.6 FEET NORTHEAST OF THE NORTHEAST LEG OF THE LOOKOUT TOWER. THERE WAS NO SUITABLE LOCATION FOR AN AZIMUTH MARK. THE STATION MARK HAS 1937 STAMPED ON THE MARK. HEIGHT OF LIGHT ABOVE STATION MARK 22.5 METERS.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in December 1991.
  • 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.