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Details for Benchmark: JU0492

N 39° 18.017 W 074° 37.333 (NAD 83)

Altitude: 5.91

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

Location:
In ATLANTIC county, NJ View Original Datasheet
Designation:
TIDAL 2 STA 71
Marker Type:
tidal station disk
Setting:
setting not listed - see description
Stability:
Mark of questionable or unknown stability.

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Found it while exploring the Beesley's Point Bridge

[Photos:]
photoNature Taking Back What Was Once Hers
photoBenchmark
photoBenchmark
N 39° 18.025 W 074° 37.348

The station was recovered in good condition on a closed section of US Route 9 where it crosses a small island known as Drag Island. This part of Route 9 was closed in 2004 due to the deteriorated condition of the adjacent Great Egg Harbor Bay bridge. Traffic is now detoured onto the Garden State Parkway but you can still drive partway down the closed road and then park and walk a short way. The station is 2' east of a NJ Geodetic Survey witness post, 40' south of a no stopping or standing traffic sign and directly under a guard cable on the southbound shoulder.

[Photos:]
photoTidal 2 Sta 71 - JU0492
Closeup of disk
photoTidal 2 Sta 71 - JU0492
With NJGS witness post
photoTidal 2 Sta 71 - JU0492
Traffic sign (not much traffic any more) with witness post in background

Documented History (by the NGS)

01/01/1937 by CGS (MONUMENTED)
01/01/1961 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1961 0.5 MI SW FROM SOMERS POINT. 0.5 MILE SOUTHWEST ON U.S. HIGHWAY 9 FROM THE JUNCTION WITH THE GARDEN STATE PARKWAY. 254 YARDS NORTHEAST OF THE NORTHEAST END OF BEASLEYS POINT BRIDGE OVER GREAT EGG HARBOR BAY, 61 FEET SOUTHEAST OF THE HIGHWATER LINE, 17.5 FEET NORTHWEST OF THE CENTER LINE OF U.S. HIGHWAY 9 AND 2 FEET NORTHWEST OF GUARD RAIL FENCE. SET IN THE TOP OF AN 8 INCH TILE FILLED WITH CONCRETE 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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