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Details for Benchmark: AH9190

N 40° 34.233 W 074° 27.200 (NAD 83)

Altitude: 69.98

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

Location:
In MIDDLESEX county, NJ View Original Datasheet
Designation:
12 X 3
Marker Type:
survey disk
Setting:
retaining walls, concrete ledge, etc.
Stability:
May hold, but of type commonly subject to surface motion.

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Found it.®

N 40° 34.296 W 074° 27.142

Found easily by description. South of Woodrow, east of Washington.

[Photos:]
photoAH9190 Piscataway Middlesex NJ Close Up
photoAH9190 Piscataway Midlesex NJ View Southeast

I found this to be off quite a bit also used the description and Mr. Magoo's picture to locate it.
Benchmark is in good condition.

I agree with Scottpop on this one. The coordinates brought me almost 2 streets away!! Went by description and found it in short order.

[Photos:]
photoThe Mark
Mark is in Fine shape!
photoStreet View
Note how far the culvert is off the street. Arrow points to Mark location. Also note utility pole in foreground
N 40° 34.302 W 074° 24.140

Find #1, 2:25pm. This was our first search for a geodetic marker. Being unexperienced, I loaded in the waypoint, and went straight to it, and soon realized we weren't very near to where the described place was. So, we started looking for it based on the description, and quickly found the concrete wall after finding the nearby telephone pole. It was another 5 minutes of searching around before I found the marker under some weeds growing across the top of the wall (which I cleared away for the picture). The marker was 3 5/8 in diameter. I included the WGS84 coordinates I got, so you should be able to get there quicker if you're just going by corrdinates. The altitude provided was right on. Be careful of the poison ivy around that area.

[last edit: 8/10/2002 9:52:23 PM PST]

Documented History (by the NGS)

01/01/1997 by NJGS (MONUMENTED)
DESCRIBED BY NEW JERSEY GEODETIC SURVEY 1997 (JVS) THE STATION IS LOCATED IN THE TOWNSHIP OF PISCATAWAY. TO REACH THE STATION FROM THE INTERSECTION OF INTERSTATE HIGHWAY I 287 AND WASHINGTON AVENUE, COUNTY ROAD 665 AT INTERCHANGE 6, GO NORTH ON WASHINGTON AVENUE FOR 0.4 MI (0.6 KM) TO THE INTERSECTION WITH STELTON ROAD, COUNTY ROAD 529 AT A TRAFFIC LIGHT. TURN LEFT AND GO 0.1 MI (0.2 KM) TO A FORK IN THE ROAD. TAKE THE RIGHT FORK AND GO 0.7 MI (1.1 KM) TO THE STATION ON THE RIGHT, JUST BEFORE THE TEE INTERSECTION WITH WOODROW AVENUE ON THE LEFT, SET FLUSH IN A DRILL HOLE IN THE TOP OF A CONCRETE CULVERT HEADWALL. THE STATION IS 8.5 M (27.9 FT) SOUTHEAST FROM UTILITY POLE NUMBER 7767 PC, 12.4 M (40.7 FT) EAST FROM THE CENTERLINE OF WASHINGTON AVENUE, 21.7 M (71.2 FT) SOUTHEAST FROM A MANHOLE LOCATED AT THE INTERSECTION OF WOODROW AVENUE AND WASHINGTON ROAD AND 21.6 M (70.9 FT) EAST SOUTHEAST FROM UTILITY POLE NUMBER 65626 PC.

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 January 2001. No vertical observational check was made to the station.
  • 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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