Location.--Latitude 47°50'15", Longitude 121°39'56", in SW 1/4 SW 1/4 Section 9, Township 27 North, Range 9 East, in Snohomish County, Hydrologic Unit 17110009, on right bank 2.0 miles southast of Gold Bar, and at river mile 43.0 mile. Drainage area is 535 square miles. Datum of gage is 209.26 feet above NGVD of 1929.