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Details for Benchmark: JU0491

N 39° 18.600 W 074° 36.917 (NAD 83)

Altitude: 17.41

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

Location:
In ATLANTIC county, NJ View Original Datasheet
Designation:
TIDAL 3 STA 71
Marker Type:
tidal station disk
Setting:
setting not listed - see description
Stability:
Mark of questionable or unknown stability.

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Documented History (by the NGS)

01/01/1937 by CGS (MONUMENTED)
01/01/1961 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1961 0.8 MI NW FROM SOMERS POINT. 0.65 MILE NORTHWEST ON COUNTY ROAD 559 FROM THE JUNCTION WITH U.S. HIGHWAY 52 IN SOMERS POINT THENCE 0.2 MILE SOUTHWEST ON U.S. HIGHWAY 9. 0.2 MILE NORTHEAST FROM THE JUNCTION OF U.S. HIGHWAY 9 AND THE GARDEN STATE PARKWAY ON THE PROPERTY OF MARGARET ROBERTS (MRS. F.L. HYATT). 95 FEET SOUTHWEST OF THE CENTER LINE OF THE DRIVEWAY TO A HOUSE, 68 FEET SOUTH AND ACROSS THE HIGHWAY FROM A POWER LINE POLE ACE 985 AND 39 FEET SOUTHEAST OF THE CENTER LINE OF U.S. HIGHWAY 9. SET IN AN 8 INCH TILE FILLED WITH CONCRETE AND LEVEL WITH THE GROUND. NOTE-- GREAT EGG HARBOR BAY HIGHWAY BRIDGE.

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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