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Details for Benchmark: SY1345

N 47° 03.317 W 123° 00.383 (NAD 83)

Altitude: 67.82

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

Location:
In THURSTON county, WA View Original Datasheet
Designation:
2323 U OF W
Marker Type:
survey disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Recovered “2323 U OF W” in good condition.

We checked all measurements (other than driving mileages) from the 1973 description.
Changes and additions to that description are as follows:

  • We found the mark at 26 feet south-southwest from the painted centerline of the road.

  • The marks found on the power line pole were as follows:
    Horizontally: “EI – G”,
    Vertically: “2 - 8”
    Vertically: “PSE INTOLIGHT SLAR9068”

  • The mark is approximately 4 feet above the road surface.

  • The right-of-way fence has metal posts with 3 strands of barbed wire at the top and woven wire fence below that – all galvanized.

  • The disk is 74 mm in diameter.

(Our Garmin nuvi 760 GPSr gave the mark’s location as N 47° 03.336 W 123° 00.393 (with “22 Foot Accuracy”)).

[Photos:]
photoSY1345 - Disk – Mud Bay, Washington.
photoSY1345 - Eye level view.
Looking south-southwest at disk in top of rock.
photoSY1345 - Looking south-southwest – wide.
Looking across Madrona Beach Road. We placed an orange marker on top of SY1345 (just under the right arrow). The guardrail with the wooden posts (in the back of the photo) is for Highway 101.

Documented History (by the NGS)

Unknown by LOCENG (MONUMENTED)
01/01/1973 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 4.1 MI W FROM OLYMPIA. 3.5 MILES WEST ALONG HARRISON AVENUE AND MUD BAY ROAD NORTHWEST FROM THE JUNCTION OF DIVISION STREET AT OLYMPIA, THENCE 0.6 MILE NORTHWEST ALONG MADRONA BEACH ROAD NORTHWEST, 0.35 MILE NORTHWEST OF A CONCRETE BRIDGE OVER PERRY CREEK, 0.15 MILE SOUTHEAST OF THE JUNCTION OF U.S. HIGHWAY 101 AND STATE HIGHWAY 8, 1 POWER LINE POLE SOUTHEAST OF A POWER LINE CROSSING, AT THE JUNCTION OF A DRIVEWAY LEADING NORTHEAST TO A HOUSE, 25 FEET SOUTHWEST OF THE CENTER LINE OF THE ROAD, 78 1/2 FEET SOUTHWEST OF AND ACROSS THE ROAD FROM POWER LINE POLE 13 WITH A TRANSFORMER, IN THE TOP OF A LEDGE OF OUTCROP WHICH PROJECTS ABOUT 1 FOOT ABOVE THE GROUND, 26 FEET NORTHWEST OF THE EXTENDED CENTER LINE OF THE DRIVEWAY, 2.6 FEET NORTHEAST OF THE NORTHEAST RIGHT OF WAY FENCE OF U.S. HIGHWAY 101, 21.8 FEET NORTHWEST OF BENCH MARK M 461, AND ABOUT 3 FEET HIGHER THAN THE ROAD. SECTION 12, T 18N, R 3W.
01/01/1980 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 RECOVERED IN GOOD CONDITION.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (CMS) RECOVERED IN GOOD CONDITION.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (JCK) RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (G = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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