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Details for Benchmark: SX1265

N 47° 22.293 W 121° 40.406 (NAD 83)

Altitude: 2975

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

Location:
In KING county, WA View Original Datasheet
Designation:
LITTLE MTN
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

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 LOCATED ABOUT 10 MILES SOUTHEAST OF NORTH BEND, 6 MILES EAST-SOUTHEAST OF CEDAR FALLS IN THE SW 1/4 SECTION 21, T 22 N, R 9 E AND ON THE PROPERTY OF THE SEATTLE WATER DEPARTMENT. TO REACH THE STATION FROM THE CEDAR FALLS RAILROAD DEPOT WHICH IS ABOUT 5 MILES SOUTH OF NORTH BEND, GO NORTH ON PAVED ROAD FOR 1.3 MILES TO CROSSROADS. TURN RIGHT AND GO EAST FOR 0.6 MILE TO CROSSROAD, CONTINUE EAST FOR 0.1 MILE TO A SIDE ROAD RIGHT. CONTINUE EASTERLY FOR 1.1 MILES TO A SIDE ROAD RIGHT, CONTINUE FOR 0.4 MILE TO A FORK. KEEP LEFT FORK AND GO EASTERLY FOR 1.9 MILES TO A FORK, KEEP THE RIGHT FORK AND CONTINUE EASTERLY ON ROAD NUMBER 200 FOR 0.85 MILE TO A FORK. KEEP THE LEFT FORK, EASTERLY ON ROAD NUMBER 200 FOR 3.7 MILES TO A FORK. KEEP THE LEFT FORK ON ROAD NUMBER 300 FOR 1.1 MILES TO A SIDE ROAD RIGHT, CONTINUE AHEAD ON ROAD NUMBER 100 FOR 0.95 MILE TO A FIVE-WAY INTERSECTION. TAKE THE SECOND ROAD FROM THE LEFT AND GO WESTERLY UPHILL FOR 1.6 MILES TO A FORK, KEEP RIGHT FORK, UPHILL, FOR 0.1 MILE TO A FORK. KEEP RIGHT FORK UPHILL FOR 0.15 MILE TO A FORK, KEEP RIGHT FORK FOR 0.1 MILE TO FORK. KEEP LEFT FORK FOR 0.15 MILE TO FORK, KEEP LEFT FORK FOR 0.05 MILE TO THE TOP OF MOUNTAIN. TURN SHARP LEFT AND GO WEST FOR ABOUT 200 FEET TO THE HIGHEST POINT OF HILL AND THE STATION. STATION MARK IS A STANDARD DISK, STAMPED LITTLE MTN 1973, SET IN THE TOP OF A 12-INCH CYLINDRICAL CONCRETE MONUMENT THAT PROJECTS 4 INCHES. THE UNDERGROUND STATION MARK DISK IS STAMPED LITTLE MTN 1973, SET IN AN IRREGULAR MASS OF CONCRETE 30 INCHES BELOW THE GROUND SURFACE. IT IS 43 FEET SOUTH OF THE APPROXIMATE CENTER OF TRACK ROAD, 25.5 FEET NORTH-NORTHEAST OF A METAL WITNESS POST AND 5.7 FEET NORTHWEST OF ANOTHER WITNESS POST. REFERENCE MARK 1 IS A STANDARD DISK, STAMPED LITTLE MTN NO 1 1973, CEMENTED IN A DRILL HOLE IN A 3 BY 4-FOOT ROCK OUTCROP THAT PROJECTS 3 FEET ON THE SOUTHWEST SIDE. IT IS 5.8 FEET NORTHEAST OF A METAL WITNESS POST AND ABOUT THE SAME ELEVATION AS THE STATION. REFERENCE MARK 2 IS A STANDARD DISK, STAMPED LITTLE MTN NO 2 1973, CEMENTED IN A DRILL HOLE IN A MASS OF ROCK OUTCROP. IT IS 7.0 FEET WEST OF A METAL WITNESS POST AND 69 FEET SOUTH OF THE APPROXIMATE CENTER OF THE TRACK ROAD. NO SUITABLE LOCATION FOR A DISTANT REFERENCE MARK. HEIGHT OF LIGHT ABOVE STATION MARK 14.3 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.

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