Details for Benchmark: JU0493

N 39° 17.817 W 074° 37.433 (NAD 83)

Altitude: 12

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

Location:
In ATLANTIC county, NJ View Original Datasheet
Designation:
TIDAL 1 STA 71
Marker Type:
tidal station disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Navigation

Didn't find it 08/23/2011 Osprey2 couldn't find JU0493   Visit Log

This location is on the former Beesleys Point Bridge over the Great Egg Harbor Bay which is on a section of U.S. Highway 9 that has been closed and abandoned since 2004. I could not find the mark at the described location on the bridge. The station may have been paved over since it was placed in 1939.

[Photos:]
photoTidal1-2
Mark should be on right side of road in foreground. Can see the old drawbridge in background - they keep it raised all the time for boats.
photoTidal1-1
Mark should be near GPSr based on measurements

Documented History (by the NGS)

01/01/1937 by CGS (MONUMENTED)
01/01/1961 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1961 0.9 MI SW FROM SOMERS POINT. 0.9 MILE SOUTHWEST ON U.S. HIGHWAY 9 FROM THE JUNCTION WITH THE GARDEN STATE PARKWAY, 643.5 FEET SOUTHWEST OF THE NORTHEAST END OF THE BRIDGE FLOOR OVER GREAT EGG HARBOR BAY, 545 YARDS NORTHEAST OF THE CENTER OF THE BRIDGE TENDER HOUSE, 0.5 FEET NORTHEAST AND AT THE SOUTH CORNER OF SECTION 82 (SECTIONS ARE NUMBERED ON THE SOUTHEAST SIDE OF THE BRIDGE), 0.5 FOOT SOUTHEAST OF THE NORTHWEST GUARD RAIL OF THE BRIDGE. SET IN A DRILL HOLE IN THE BRIDGE FLOOR LEVEL WITH 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.
  • 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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