Location.--Latitude 47°57'56", Longitude
118°58'54", in SW 1/4 SE 1/4 Section 30, Township 29 North,
Range 30 East, in Okanogan County, Hydrologic Unit 17020005, in
pier 3 on west side of bridge on State Highway 155, 3,200 ft downstream
from Grand Coulee Dam, 14.2 mi upstream from Nespelem River, and at
mile
596.6. Drainage
area is 74,700 mi2, approximately. Datum of
gage is NGVD of 1929, adjustment of 1937, Bureau of Reclamation
datum.