Details for Benchmark: HU0270

N 38° 20.033 W 075° 05.800 (NAD 83)

Altitude: 13.86

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

Location:
In WORCESTER county, MD View Original Datasheet
Designation:
G 104
Marker Type:
bench mark disk
Setting:
abutments and piers of large bridges
Stability:
Probably hold position/elevation well.

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Navigation

Found it 07/15/2020 Jimmy Z found HU0270   Visit Log

Spotted this one while walking the bridge to take a pic for the nearby Earthcache.
Jimmy Z

[Photos:]
photoMy foot and the BM
Found it 03/17/2011 micastang found HU0270   Visit Log

Alive and well

[Photos:]
photoHU0270
Found it 09/16/2007 Ernmark found HU0270   Visit Log

Recovered in good condition..

[Photos:]
photoG 104 (HU0270) disk - West Ocean City, MD
photoG 104 (HU0270) setting - view looking NW
photoG 104 (HU0270) area - view looking E
Found it 07/08/2005 jewild found HU0270   Visit Log

I will never visit this town again over the 4th of July.
Caching was still fun, even though you couldn't drive anywhere, from so much traffic.
Skeaky Pete's looks good though!

[Photos:]
photoHU270
Found it 10/22/2004 deano1943 found HU0270   Visit Log

Found as described.
Found it 09/05/2003 Zhanna found HU0270   Visit Log
N 38° 20.046 W 075° 05.805

This benchmark disk was found as described on the north end of the west abutment of the Assawoman Bay Bridge, approximately 0.5 miles west-northwest of the intersection of Philadelphia Avenue and U.S. Route 50 in downtown Ocean City. The mark was located easily using the historic description, and no changes are necessary. At the site, I recorded coordinates that are approximately 85 feet from the scaled coordinates given on the datasheet. The disk is in good condition and the date and designation are legible.

Zhanna

[Photos:]
photoHU0270, Worcester County, MD
photoLooking northwest, as the sun begins to set ...
Hooper's Crab House is in the background.

Documented History (by the NGS)

01/01/1962 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1962 AT OCEAN CITY. SET IN A DRILL HOLE IN THE NORTHEAST CONCRETE ABUTMENT AT THE NORTHWEST END OF U.S. HIGHWAY 50 BRIDGE OVER SINEPUXENT BAY. 9 FEET NORTHEAST OF THE NORTHEAST CURB OF HIGHWAY 50 AND 1 FOOT ABOVE THE LEVEL OF THE HIGHWAY.
01/01/1984 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984 RECOVERED IN GOOD CONDITION.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (RBD) RECOVERED IN GOOD CONDITION.
05/14/1991 by MDSHA (GOOD)
RECOVERY NOTE BY MARYLAND DOT HIGHWAY ADMINISTRATION 1991 THE MARK IS LOCATED ABOUT 6.65 MI (10.70 KM) EAST OF BERLIN, 0.53 MI (0.85 KM) WEST OF OCEAN CITY AND ON ROAD RIGHT-OF-WAY. TO REACH FROM THE INTERSECTION OF U.S. 50 AND 113, GO EAST ON U.S. HIGHWAY 50 FOR 6.6 MI (10.6 KM) TO THE ASSAWOMAN BAY BRIDGE AND THE MARK ON THE LEFT. IT IS 32.0 FT (9.8 M) NORTH OF THE CENTER LINE OF U.S. HIGHWAY 50, 9.8 FT (3.0 M) NORTHWEST OF THE WEST END OF A CHAIN LINK FENCE, 2.7 FT (0.8 M) NORTHEAST OF A LIGHT POLE, AND SET IN A DRILL HOLE IN THE WEST ABUTMENT OF THE BRIDGE.

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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