Location.--Latitude 46°48'09", Longitude
122°18'37", in SE 1/4 NW 1/4 Section 9, Township 15 North,
Range 4 East, in Thurston County, Hydrologic Unit 17110015, near
left end of Alder Dam on Nisqually River, 1.0 mile west of Alder, 1.7
miles upstream of La Grande Dam, 4.6 miles upstream of Mashel River,
and at river mile
44.2. Drainage
area is 286 mi2. Datum of
gage is 7.61 feet above NGVD of 1929.