N 20.4 PICK CREEK (Lake Nerka) 



LOCATION: 59°33'00" N. 159**OU'l8" W. 



PREVIOUS NAMES OR NIMBERS: 



U.S.G.S. MAP: Goodnews, Alaska, 1:250,000, I95I 



PHYSICAL DESCRIPTION 



TOTAL LENGTH: 2-5 miles 



LENGTH ACCESSIBLE TO SAmON: 2-5 miles 



AVERAGE WIDTH: 15' RANGE: 12 '-35' 



AVERAGE DEPTH: I8" RAITOE: 12"-U2" 



TOTAL ACCESSIBLE SPAWNTOG AREA: 4.55 acres 



POTENTIAL SPAWNING AREA: 90^j U.IO acres 



BOTTOM QUALITY: 80^ gravel, lO^i sand, 1(4 mud 



WATERSHED: 4.5 square miles. Flows frcm a series of spring ponds through 

 flat valley of tundra, beaver ponds, and grass. Occasionally temporary 

 beaver dams across creeks. Usually no blockage. 



GRADIENT: 



mTER VELOCITY: Average = 2.3 fps. 



Range = I.5-3.6 'fps. 



FLOW: 22.4 cfjS.(Aug. 6, I960). Medium RANGE: 

 water level. Flow station at mouth. 



AIR TEIvIPERATURE: 12.8° C. (Aug. 6, I96O) 



WATER TEMPERATURE: 8.3" C. (Aiog. 6, I96O) 



P00I5 AND RIFFLES: Many small deep areas against cut banks. 



75 



