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Details for Benchmark: NJ0067

N 42° 06.250 W 090° 09.450 (NAD 83)

Altitude: 630.03

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

Location:
In CARROLL county, IL View Original Datasheet
Designation:
G 57
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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I don't think I'll go down there for a close-up photo either. But a rough zoom photo might work.

Found on our way out of town after a weekend of camping at Mississippi Palesades. Still looks in good condition, but did not go down there for a close-up.

[Photos:]
photoNJ0067_G57_BMD

9:30 AM, Mark in good condition.

Found this marker today, unable to get closeup photo safely,need a harness and lanyard!Photos to come.

[Photos:]
photodisk,way down there
photoviewed from east end of bridge
disk is on top of the cement pillar, I don't feel agile enough anymore to take a chance climbing over the edge to get down there

Documented History (by the NGS)

01/01/1934 by CGS (MONUMENTED)
01/01/1970 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1970 0.8 MI N FROM SAVANNA. ABOUT 0.05 MILE WEST ALONG MADISON STREET FROM THE POST OFFICE AT SAVANNA, THENCE 0.75 MILE NORTH ALONG U.S. HIGHWAY 52, AT THE EAST END OF THE HIGHWAY BRIDGE OVER THE MISSISSIPPI RIVER, 13 FEET NORTH OF THE CENTER LINE OF THE HIGHWAY, SET IN THE TOP OF THE NORTH END OF THE EAST CONCRETE PIER, AND ABOUT 5 FEET BELOW THE LEVEL OF THE BRIDGE FLOOR. SEC 4, T24N, R3E. NOTE-- THIS MARK IS ALSO 2.95 MILES NORTH ALONG U.S. HIGHWAY 52 FROM THE MUNICAPAL BUILDING AT SABULA, IOWA.
01/01/1977 by LOCSUR (GOOD)
RECOVERY NOTE BY LOCAL SURVEYOR (INDIVIDUAL OR FIRM) 1977 RECOVERED IN GOOD CONDITION.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (GG) RECOVERED IN GOOD CONDITION.
05/24/1995 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1995 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.

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