107 



I 156.8: 2. 7L OLD WILLIAMS CREEK ( Iliamna River) 



LOCATION: 59*^^'l8" N. 153°5lf'12" W. 



PREVIOUS NAMES OR NUMBERS: D8b 



U.S.G.S. MAP: Iliamna, 1:250,000 



PHYSICAL DESCRIPTION 



TOTAL LENGTH: 8.9 miles 



LENGTH ACCESSIBLE TO SAmON: 1.1 miles 



AVERAGE WIDTH: 20' RANGE: 15 '-25' 



AVERAGE DEPTH: I8" RANGE: ^"-2k" 



TOTAL ACCESSIBLE SPAWNING AREA: 13,068 square yards (2-7 acres) 



POTENTIAL SPAWNING AREA: 17^, 1,936 square yards (0.4 acre) 



BOTTOM QUALITY: 17^ <l/8", 40^ l/8"-3", 33^ 3 ""12", 10^ >12". Poor spawn- 

 ing facilities. Silt in lower reaches, rubble bottom below accessible 

 limit. Bottom fairly stable. 



WATERSHED: 20 square miles. Lower part flows across Iliamna River valley, 

 upper portion through a stream-cut valley. Subject to occasional 

 flooding. 



GRADIENT: 



WATER VELOCITY: 2.5 fps 



FLOW: 60 cfs (July 22, I962). Measured RANGE: 

 jiost above mouthy normal summer flow. 



AIR TEMPERATURE: 23.0* C. (July 22, I962) 



WATER TEMPERATURE: 11-5° C. (July 22, I962) 



P00I5 AND RIFFLES: 



