Station: GWM 17 (stamped GWM 17 276 1942)
PID JT0105

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Latitude   38 46 52.25688N
Longitude   122 02 38.10680W
Northing   -623,718.196
Easting   1,996,184.076
Height in meters:
  Orthometric   84.85
  Ellipsiod   54.289

The station is located about 8 mi west of Zamora and about 5 mi north of Capay.
To reach the station from the intersection of Interstate Highway 505 and State Highway 16, about 1 mi east of Madison, go northwesterly on Highway 16 for about 5 mi, passing through the town of Esparto, to a side road right, County Road E4, Road 85, in the town of Capay. Turn right and go north on Road E8 for about 5 mi to the intersection of County Road E10, Road 14, and the station on the left in the northwest quadrant of the intersection.

The station is a standard USGS disk set in concrete. It is 11.3 m north of the centerline of Road E10, 5.2 m west of the centerline of Road E4, 5.0 m north of a telephone pole, 3.7 m north of a fence corner, 1.0 m north of a carsonite witness post and set in the fence line.