Location.--Latitude 46°32'04", Longitude
120°27'58", in NW 1/4 NE 1/4 Section 17, Township 12 North,
Range 19 East, in Yakima County, Hydrologic Unit 17030003, on
left bank 2,200 feet upstream from Ahtanum Creek, 0.8 mile upstream
from Wapato Dam, 1.4 miles southeast of Union Gap, and at river mile
107.3. Drainage
area is 3,479 mi2. Datum of
gage is 900.00 feet above NGVD of 1929.