Location.--Latitude 47°25'23", Longitude
122°15'51", in SE 1/4 NW 1/4 Section 2, Township 22 North,
Range 4 East, in King County, Hydrologic Unit 17110013, on
upstream side of 200th street bridge, and river mile
17. Drainage
area is 451 mi2. Datum of
gage is NAVD of 1988.