Details for Benchmark: SG0001
N 47° 25.583 W 087° 59.600 (NAD 83)
Coordinates may not be exact. Altitude is ADJUSTED and location is SCALED. (more info)
- In KEWEENAW county, MI View Original Datasheet
- E 66
- Marker Type:
- bench mark disk
- set into the top of a round concrete monument
- May hold, but of type commonly subject to surface motion.
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Documented History (by the NGS)
|01/01/1934 by CGS (MONUMENTED)
|DESCRIBED BY COAST AND GEODETIC SURVEY 1934
21 MI N FROM MOHAWK. ABOUT 21 MILES NORTH ALONG U.S. HIGHWAY 41 FROM MOHAWK, KEWEENAW COUNTY, ABOUT 6 MILES WEST OF COPPER HARBOR, 2 MILES WEST OF MEDORA LAKE, ON THE SUMMIT OF A WINDING HILL, BETWEEN TWO 3-FOOT RED OAK TREES, AND 35 FEET NORTH OF THE CENTERLINE OF THE ROAD. A STANDARD DISK, STAMPED E 66 1934 AND SET IN THE TOP OF A CONCRETE POST.
|12/28/1994 by MIDT (GOOD)
|RECOVERY NOTE BY MICHIGAN DEPARTMENT OF TRANSPORTATION 1994 (BRT)
IN SECTION 16, T-58-N, R-29-W. ABOUT 21.0 MI (33.8 KM) NORTH ALONG U.S. HIGHWAY 41 FROM MOHAWK, 6.0 MI (9.7 KM) WEST OF COPPER HARBOR, 2.0 MI (3.2 KM) WEST OF MEDORA LAKE, AND ON THE SUMMIT OF A WINDING HILL BETWEEN TWO 3-FT RED OAK TREES. STATION IS 26.0 FT (7.9 M) NORTH OF THE CENTERLINE OF HIGHWAY 41 AND 2.0 FT (0.6 M) WEST OF A CARSONITE WITNESS POST.
|07/17/1996 by NGS (GOOD)
|RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1996 (GAS)
9.9 KM (6.15 MI) SOUTHERLY ALONG U.S. HIGHWAY 41 FROM THE JUNCTION OF STATE HIGHWAY 26 IN COPPER HARBOR, 0.9 KM (0.55 MI) WEST OF A ROAD SIDE PARK, 340.0 M (1115.5 FT) EAST OF THE SUMMIT OF A HILL, 56.3 M (184.7 FT) EAST OF THE CENTER OF A TRACK ROAD, 14.0 M (45.9 FT) NORTH OF THE NORTH LEG OF A HIGHWAY INFORMATION SIGN, 3.8 M (12.5 FT) EAST OF A 40-INCH MAPLE TREE, 0.5 M (1.6 FT) ABOVE THE LEVEL OF THE HIGHWAY, AND THE MONUMENT PROJECTS 0.1 M (0.3 FT) ABOVE THE GROUND SURFACE.
- 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.