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Details for Benchmark: RD1455

N 45° 27.117 W 123° 50.850 (NAD 83)

Altitude: 23.2

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

Location:
In TILLAMOOK county, OR View Original Datasheet
Designation:
A 714
Marker Type:
metal rod
Setting:
stainless steel rod in sleve
Stability:
Most reliable and expected to hold position/elevation well.

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Recovered in good condition.
(Our Garmin nuvi 760 GPS gave the location as: N 45° 27.119 W 123° 50.879 (with “18 Foot Accuracy”).

Notes/additions to the 1987 descriptions are as follows:
- We found the mark at 39.5 feet north from the center of Ninth Street.
- We found the mark at 57 feet straight west from the west curb of the parking lot.
- We found the mark at 20.4 feet approximately north from the closest edge of a Tillamook P.U.D. utility pole with the following markings: horizontal label: “257211”, vertical label: “090112 2”,
- We did not find a witness post. We found the mark 1.88 meters east of a fence that is hidden by shrubbery.
- The mark is 12 meters south of a chain link school-yard fence.

[Photos:]
photoRD1455 - Designation stamping – Tillamook, Oregon
photoRD1455 – Logo cap open
photoRD1455 – Logo cap closed
photoRD1455 - Looking north – wide.
For the photo, the location is marked by a red and white open reel tape measure that is sitting on top of the monument cover in the lawn.
photoRD1455 - Looking southwest - wide.
Mark is hidden by grass but the location is shown by yellow arrow.

Documented History (by the NGS)

01/01/1987 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1987 IN TILLAMOOK. IN TILLAMOOK, AT THE INTERSECTION OF NINTH STREET AND MANOR PLACE, IN THE SOUTHWEST CORNER OF THE LIBERTY ELEMENTARY SCHOOL LAWN, PERMISSION GIVEN BY THE MAINTENANCE DIRECTOR CLYDE ELLIS, 503-842-4415, 40.1 M (131.6 FT) EAST OF THE CENTER OF MANOR PLACE, 12.2 M (40.0 FT) NORTH OF THE CENTER OF THE STREET, 17.0 M (55.8 FT) WEST OF THE WEST CURB OF A PARKING LOT, AND 6.3 M (20.7 FT) NORTH OF UTULITY POLE NUMBER 257211 1516. NOTE--ACCESS TO DATUM POINT IS HAD THROUGH A 5-INCH LOGO CAP. THE MARK IS 1.7 METERS E FROM A WITNESS POST AND FENCE THE MARK IS ABOVE LEVEL WITH THE STREET.

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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