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Details for Benchmark: MD0164

N 41° 19.283 W 084° 11.983 (NAD 83)

Altitude: 669.94

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

Location:
In HENRY county, OH View Original Datasheet
Designation:
671
Marker Type:
survey disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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N 41° 19.287 W 084° 11.998

Station recovered in fair condition. Coordinates listed above. This bridge was completely rebuilt about 5 years ago, and all the wing walls and abutments were removed and replaced, except for the section of wingwall containing this benchmark. The station has a number of scratches and light damage to it, but is still useable. Note that there is an active Bald Eagle nest just to the north from the station, and that travelling along the river bank any further north than this station is prohibited by the Ohio DNR, which often patrols this area.

[Photos:]
photoBM_MD0164_1.jpg
photoBM_MD0164_2.jpg
photoBM_MD0164_3.jpg
Looking SE from below the guard rail
photoBM_MD0164_4.JPG
Looking SE from the new bridge deck
photoBM_MD0164_6.jpg
Warning signs looking north from benchmark

Documented History (by the NGS)

Unknown by CGS (MONUMENTED)
01/01/1963 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1963 AT FLORIDA. LOCATED IN THE SOUTHERN PART OF TOWN IN FLORIDA AT THE MAUMEE RIVER BRIDGE, ABOUT 0.1 MILE SOUTH OF HIGHWAY 24, AND 17.0 FEET EAST OF THE CENTERLINE OF COUNTY ROAD. A STANDARD USGS DISK STAMPED 671, SET IN A DRILL HOLE IN TOP OF THE NORTHEAST CORNER OF THE NORTHEAST ROCK WING-WALL.

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 1992. No vertical observational check was made to the station. * This is a POSTED BENCH MARK height. Code NC indicates the bench mark was located on a no-check spur therefore a value was not computed.
  • 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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