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Details for Benchmark: RD1153

N 45° 57.167 W 123° 55.567 (NAD 83)

Altitude: 41.95

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

Location:
In CLATSOP county, OR View Original Datasheet
Designation:
N 46
Marker Type:
survey disk
Setting:
pavements (street, sidewalk, curb, apron, etc.)
Stability:
Mark of questionable or unknown stability.

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Found on bridge in good condition.

Found in good condition.

Found today while driving through Seaside. Good to get this one.

[Photos:]
photoRD1153

Spotted this one by accident since I was on the wrong side of the road. I guess there is always a silver lining to everything we do.

Sometimes having your GPS coordinates off, lets you find other things. Two finds one on each side of the bridge.

found because pdxrose and I were on the wrong side for a cache

Found while looking for a nearby geocache.

[Photos:]
photobenchmark

found while caching, love those ones you are not expecting

Found near geocache in area, right where description noted.

N 45° 57.191 W 123° 55.589

Found as described.

[Photos:]
photoRD1153 - overview
mark is visible on lower curb on bridge closest to camera. View is looking towards the south.
photoRD1153 - closeup with designation visible

Documented History (by the NGS)

01/01/1930 by ORHD (MONUMENTED)
01/01/1965 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1965 3.7 MI SE FROM SEASIDE. 3.7 MILES SOUTHEAST ALONG U.S. HIGHWAYS 26 AND 101 FROM THE SEASIDE UNION HIGH SCHOOL AT THE NORTHEAST CORNER OF THE CONCRETE BRIDGE OVER THE NECANICUM RIVER, 400 FEET SOUTH OF MILE POST NO. 24, 16 FEET EAST OF THE CENTER OF THE HIGHWAY IN THE CONCRETE CURB OF THE BRIDGE.
01/01/1984 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1984 RECOVERED IN GOOD CONDITION.
01/01/1986 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1986 (GAN) RECOVERED IN GOOD CONDITION.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (RCC) RECOVERED IN GOOD CONDITION.
01/01/1987 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1987 RECOVERED IN GOOD CONDITION, A NEW DESCRIPTION FOLLOWS. 4.7 KM (2.90 MI) SOUTHERLY ALONG U.S. HIGHWAY 101 FROM ITS JUNCTION WITH BROADWAY AVENUE IN SEASIDE, IN THE NORTHEAST CORNER OF THE EAST CURB OF A BRIDGE SPANNING THE NECANICUM RIVER, 4.4 M (14.4 FT) EAST OF THE CENTERLINE OF THE HIGHWAY AND 0.1 M (0.3 FT) SOUTHWEST OF THE NORTHEAST END OF THE CURB. THE MARK IS 0.2 M ABOVE THE HIGHWAY.

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. WARNING-Repeat measurements at this control monument indicate possible vertical movement.
  • 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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