Skip to Content

Details for Benchmark: KV1494

N 40° 35.133 W 075° 27.967 (NAD 83)

Altitude: 298.23

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

Location:
In LEHIGH county, PA View Original Datasheet
Designation:
RV 2 RDGRR
Marker Type:
rivet
Setting:
massive structures
Stability:
Probably hold position/elevation well.

Must Read!

Benchmarks may be on private property or in dangerous locations. Obey local laws. By using the services on Geocaching.com you agree to this disclaimer.

I found the location of the marker, but I could not verify if it still exists or not. I did not bring my 20 foot extension ladder along with me to reach the top of the bridge support. The marker should be located on top of the wider layer of the bridge support seen in the photos. (I believe the wider layer at the top is the coping.)

[Photos:]
photoKV1494
An image of the bridge support and coping.
photoKV1494area
A wider shot of the bridge support.

Documented History (by the NGS)

01/01/1932 by RDGRR (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1932 AT ALLENTOWN. AT ALLENTOWN, LEHIGH COUNTY, ON THE READING CO. RAILROAD, 0.3 MILE NORTHEAST OF THE MACK TRUCK CO. PLANT, AT BRIDGE 34/11 (UNDERGRADE CROSSING OF DIXON STREET), IN THE TOP OF THE NORTHEAST END OF THE NORTHWEST COPING, AND NEAR THE CHISELED LETTERS B M. A STANDARD MONEL-METAL RIVET WITHIN A CHISELED SQUARE.
01/01/1932 by CGS (GOOD)
01/01/1971 by PADT (GOOD)
RECOVERY NOTE BY PA DEPT OF TRANSP 1971 RECOVERED IN GOOD CONDITION.
01/01/1987 by LOCSUR (GOOD)
RECOVERY NOTE BY LOCAL SURVEYOR (INDIVIDUAL OR FIRM) 1987 (CT) RECOVERED IN GOOD CONDITION.

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.

Advertising with Us

Return to the Top of the Page