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Details for Benchmark: RL0789

N 46° 44.833 W 089° 04.050 (NAD 83)

Altitude: 1031.23

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

Location:
In ONTONAGON county, MI View Original Datasheet
Designation:
N 137
Marker Type:
bench mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Recovered in good condition. Station was buried by fill during construction, but appears to be stable and undisturbed. Metal witness post was found bent over and buried several inches down, but still planted in the earth. Witness sign post has been returned to vertical position, but sign has become detached, and was left buried several inches deep, directly above the mark.

From the blinking light in Mass, south 1.12 miles south along Depot Road to the mark on the right, set in the southwest quarter of the junction with East Branch Road, 71.5 feet south of the center of East Branch Road, 24.5 feet west of the center line of Depot Road.

Station is 60.5 feet southwest and across the road from a telephone cable splicing box, 32 feet southeast of a wooden directional sign post for VFW post 4167, 6 feet east of in line with a row of utility poles to the north, 1 foot east of a metal witness post with no sign attached. Station is at a point where the fill for the road shoulder begins sloping down toward the ditch, and about 18 inches below ground level.

[Photos:]
photoRL0789
photoRL0789 Immediate Area
photoRL0789 Area-looking south
photoRL0789 Area-looking north

Mark not found, but I believe it may still be there. I did a bit of searching, pacing off approximate distances from the road centers, the only remaining references really still there and pulled out the metal detector. I immediately recovered a metal witness post that had been pushed over and covered with dirt when the ditch was worked on and filled. The 1948 description references only a wooden witness post, so the station's position in relation to the metal witness post is uncertain. Witness post was stood back up. I'll do a bit more searching at this location when I have more time to work on it.

MARK NOT FOUND. THERE HAS BEEN ROAD CONSTRUCTION ALONG THIS ROUTE.

Documented History (by the NGS)

01/01/1948 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1948 AT MASS. AT MASS, ABOUT 1.1 MILES SOUTH ALONG A BLACK TOP ROAD FROM ITS JUNCTION WITH STATE HIGHWAY 26, SET IN THE SOUTHWEST CORNER OF THE JUNCTION OF A GRAVEL ROAD WEST, 230 FEET NORTH OF THE NORTHWEST CORNER OF THE CHICAGO, MILWAUKEE, ST. PAUL AND PACIFIC RAILROAD STATION, 28 FEET WEST OF THE CENTER LINE OF THE BLACK TOP ROAD, 75 FEET SOUTH OF THE CENTER LINE OF THE GRAVEL ROAD WEST, 5 FEET NORTH OF A POWER POLE, 2 FEET SOUTH OF A WHITE WOODEN WITNESS POST, 3 FEET BELOW THE ROAD AND SET IN THE TOP OF A CONCRETE POST PROJECTING 4 INCHES.
01/01/1988 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1988 (GG) MARK NOT FOUND.

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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