2009-03-08

HR0475 - Z 246

County: MADERA
State: CALIFORNIA

PUBLISHED DATA
Lat: N 37° 09.067
Long: W 119° 30.317
Altitude: 1005.6
Coordinates may not be exact. Altitude is VERTCON and location is SCALED.

Designation: Z 246
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.

Documented History (by the NGS)
1/1/1935 by CGS (MONUMENTED)

1/1/1943 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1943 6.7 MI S FROM NORTH FORK. IN FRESNO COUNTY, 6.7 MILES SOUTH ALONG THE AUBERRY ROAD FROM THE SIERRA INN AT NORTH FORK, MADERA COUNTY, 42 FEET SOUTHEAST OF THE CENTERLINE OF THE ROAD, AND 5 FEET NORTHWEST OF A SAN JOAQUIN POWER COMPANY DYNAMO MONUMENT. A STANDARD DISK, STAMPED Z 246 1935 AND SE IN THE TOP OF A CONCRETE POST.


FOUND DATA
Lat: N 37° 09.082
Long: W 119° 30.314
Alt: NA

The description calls for a standard disk, stamped "Z 246 1935", set in a concrete post, 5 feet northwest of a San Joaquin Power Dynamo Monument. (The standard disk was assumed to be a USC&GS disk similar to others in the area.) Found USGS mark stamped "1009 F" at 18:20, March 8, 2009 in good condition, set in the westerly corner of the Dynamo Monument. The monument is in a fenced area covered in tall grass. A disk set in a concrete post could not be seen. Go to description is adequate. There is some damage to the southerly edge of the found USGS mark, but it is still useable for survey purposes.

Published NAD83 coordinates are located about 94 feet south of the found WGS84 coordinates. WGS84 coordinates for the mark found by 2 minute occupation approximately 8 feet northwest of the monument, with 7 strong satellites and 1 WAAS satellite.

Benchmark detail. It's a USGS mark, not the USC&GS mark I was looking for.


Coordinates outside the fence.


The Dynamo and monument. The USGS mark can be seen on the westerly corner of the granite.


The Dynamo and monument. The USGS mark can be seen on the westerly corner of the granite.


Plaques on the Dynamo monument.


One of the original Dynamos.


One of the original pumps.


The Dynamo and monument.


The Dynamo and monument. Note the date in the concrete at the bottom of the picture: October 11, 1938.


The A.G.Wishon Powerhouse, Kerckhoff Lake, California

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