Details for Benchmark: NE0392
N 42° 39.017 W 083° 10.283 (NAD 83)
Coordinates may not be exact. Altitude is ADJUSTED and location is SCALED. (more info)
- In OAKLAND county, MI View Original Datasheet
- Y 106
- 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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||c.j.miller couldn't find ne0392
I believe this benchmark, and others that are along this former railway are all missing/gone. (NE0390, NE0391, NE0392, NE0393 and possibly more). This track was removed a few years back, and is now nothing more than a foot trail.
I could still be wrong, but I looked all over the south side of the track. GPS was leading me to the edge of where the taller grass starts to grow. Didn't see any sort of concrete post with the copper peg like the description says.
I'll post two pictures of this area. It's very easy to get to from Crooks Road just before Hamlin. Park in the Vetinerary Clinic parking lot and walk over.
[Photos:]NE0392 - Pic 2
Another view of the area. Benchmark should be near the top right of this photo.
NE0392 - Pic 1
Just beyond these wood posts on the right should be the Benchmark. I didn't see one, and think it may have been removed with the train tracks.
Documented History (by the NGS)
|01/01/1934 by CGS (MONUMENTED)
|01/01/1941 by NGS (MARK NOT FOUND)
|DESCRIBED BY NATIONAL GEODETIC SURVEY 1941
2.5 MI SW FROM ROCHESTER. 2.5 MILES SOUTHWEST ALONG THE GRAND TRUNK WESTERN RAILWAY FROM THE STATION AT ROCHESTER, OAKLAND COUNTY, 145 YARDS EAST OF MILEPOST 29, AT A HIGHWAY CROSSING, 21 YARDS FROM THE CROSSING OF THE CENTERLINE OF THE HIGHWAY AND THE SOUTH RAIL, 21 FEET SOUTH OF THE SOUTH RAIL, AND ABOUT LEVEL WITH THE TOP OF THE RAIL. A STANDARD DISK, STAMPED Y 106 1934 AND SET IN THE TOP OF A CONCRETE POST.
- 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.