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Details for Benchmark: JV0585

N 39° 15.983 W 076° 34.850 (NAD 83)

Altitude: 5.37

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

Location:
In C OF BALTIMORE county, MD View Original Datasheet
Designation:
857 4680 TIDAL 31
Marker Type:
tidal station disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Found it on our last day in Baltimore.

N 39° 16.015 W 076° 34.837

Found as described in good condition.

[Photos:]
photoJV0585 mark 857 4680 TIDAL 31 Baltimore MD
Mark and GPSr
photoJV0585 area E 857 4680 TIDAL 31 Baltimore MD
View to the E, mark is in doorway of building at lower left, indicated by arrow. Navy Reserve building is to the right; Lehigh Cement elevators in the background across the harbor.

Recovered in good condition...

[Photos:]
photo857 4680 TIDAL 31 (JV0585) disk - Baltimore, MD
photo857 4680 TIDAL 31 (JV0585) setting - Baltimore, MD

Located as described.

[Photos:]
photo857 4680 Tidal 31 JV0585

Found exactly as described. Photos are constrained because the mark is located on a military facility. Handheld coordinates are N39-16.020 W076-34.832.

[Photos:]
photoJV0585 - the Mark
photoJV0585 near Baltimore, MD
Looking northwest at the south door on Building No. 4, the mark is at the white notebook, center.

Documented History (by the NGS)

01/01/1922 by CGS (MONUMENTED)
01/01/1971 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 AT BALTIMORE. AT BALTIMORE, AT FORT MC HENRY, AT THE U.S. NAVAL RESERVE TRAINING CENTER, SET IN THE TOP OF THE GRANITE DOORSILL ON THE SOUTHWEST SIDE OF BUILDING FOUR, AT THE INTERSECTION OF HALSEY ROAD AND LEAHY STREET, 19 FEET NORTHEAST OF THE CENTER LINE OF THE STREET, 22 FEET NORTHWEST OF THE SOUTH CORNER OF THE BUILDING, AND ABOUT 2 FEET ABOVE THE LEVEL OF THE GROUND.
01/01/1976 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 RECOVERED IN GOOD CONDITION.
11/28/1995 by NOS (GOOD)
RECOVERY NOTE BY NATIONAL OCEAN SERVICE 1995 (RFE) THE BENCH MARK IS SET IN THE GRANITE DOORSILL ON THE SW SIDE OF THE US NAVAL RESERVE BOILER ROOM (BUILDING 4) LOCATED AT FORT MCHENRY, 13.6 M (44.6 FT) NORTH OF THE NW CORNER OF THE MAIN US NAVAL RESERVE BUILDING, 6.7 M (22.0 FT) NW OF THE SOUTH CORNER OF BUILDING 4, 5.5 M (18.0 FT) NNE OF THE ROAD CENTERLINE, 1.4 M (4.6 FT) NW OF THE EDGE OF THE TOP STEP, AND 1 M (3.3 FT) ABOVE GRADE.

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.
  • This Tidal Bench Mark is designated as VM 433 by the Center for Operational Oceanographic Products and Services.
  • 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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