Location.--Latitude 48°29'03", Longitude
122°14'31", in NW 1/4 NW 1/4 Section 36, Township 35 North,
Range 4 East, in Skagit County, Hydrologic Unit 17110007, on
left bank peir of bridge on State Highway No. 9, 1.0 mile south of
Sedro Woolley, and at river mile
22.3. Drainage
area is 3,015 mi2, of which 400 mi2 is in
Canada. Datum of
gage is NGVD of 1929.