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Details for Benchmark: LX7156

N 41° 38.825 W 072° 49.977 (NAD 83)

Altitude: 642

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

Location:
In HARTFORD county, CT View Original Datasheet
Designation:
ANGE
Marker Type:
triangulation station disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

Reference Points

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Documented History (by the NGS)

01/01/1981 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1981 (VDN) THE STATION IS LOCATED ABOUT 4.8 KM (3.0 MI) SOUTHWEST OF NEW BRITAIN, 3.2 KM (2.0 MI) SOUTHEAST OF PLAINVILLE AND 1.1 KM (0.7 MI) NORTH FROM THE SOUTH END OF SHUTTLE MEADOW RESERVOIR IN WOODED AREA. OWNERSHIP--BOARD OF WATER COMMISSIONERS, 1000 SHUTTLE MEADOW AVENUE, NEW BRITAIN CONNECTICUT 06052. TO REACH THE STATION FROM THE JUNCTION OF STATE HIGHWAYS 10 AND 72 IN PLAINVILLE. GO SOUTH ON HIGHWAY 10 FOR 0.2 KM (0.1 MI) TO A CROSS STREET. TURN LEFT AND GO EAST ON WOODFORD AVENUE FOR 1.3 KM (0.8 MI) TO LEDGE ROAD ON RIGHT JUST AFTER PASSING UNDER INTERSTATE HIGHWAY 84. TURN RIGHT ON LEDGE ROAD AND GO FOR 2.2 KM (1.4 MI) TO A REVERSE FORK RIGHT, CONTINUE AHEAD FOR 1.6 KM (1.0 MI ) TO A SHARP CURVE IN THE ROAD, CONTINUE AHEAD FOR 0.1 KM (0.05 MI) TO A TRACK ROAD LEFT. TURN LEFT, NORTH PASSING THROUGH A CABLE GATE FOR 1 KM (0.65 MI) TO A ROAD RIGHT IN A RAVINE, CONTINUE UP STEEP HILL ON ROUGH ROAD FOR 0.3 KM (0.2 MI) TO STATION ON THE RIGHT NEAR A LARGE ROCK. THE STATION IS A STANDARD NGS DISK STAMPED---ANGE 1981---, THE DISK IS CEMENTED IN A DRILLHOLE IN A ROCK OUTCROP 14 CENTIMETERS BELOW THE GROUND. IT IS LOCATED 9.88 METERS (32.4 FT) SOUTH FROM THE APPROXIMATE CENTER OF A DIRT ROAD, 6.4 METERS (21.0 FT) WEST FROM THE WEST EDGE OF A ROCK LEDGE PROJECTING 1.5 METERS HIGHER THAN THE STATION AND 1.45 METERS (4.8 FT) NORTH FROM A METAL WITNESS POST REFERENCE MARK NUMBER 1 IS A STANDARD NGS DISK STAMPED---ANGE NO 1 1981---, SET INTO THE TOP OF A BOULDER OF 3 METERS LARGEST DIMENSION. IT IS LOCATED 11.3 METERS (37.1 FT) NORTH FROM THE APPROXIMATE CENTER OF THE ROAD AND 27.4 METERS (89.9 FT) EAST-NORTHEAST FROM A METAL WITNESS POST. MARK IS ABOVE STATION 1.5 METERS. REFERENCE MARK NUMBER 2 IS A STANDARD NGS DISK STAMPED---ANGE NO 2 1981---, SET INTO A ROCK LEDGE. IT IS LOCATED 39.9 METERS (131 FT) NORTHWEST FROM A METAL WITNESS POST AND 10.8 METERS (35.4 FT) WEST-NORTHWEST FROM THE APPROXIMATE CENTER OF THE DIRT ROAD. MARK IS ABOVE STATION 1 METER. NO MEASUREMENT BETWEEN REFERENCE MARKS BECAUSE OF TREES ON LINE. HEIGHT OF LIGHT SHOWN ABOVE THE MARK WAS 27.3 METERS. NO SUITABLE LOCATION FOR AN AZIMUTH MARK.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in August 1998.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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