91 



I 156.8 ILIAMM RIVER - MAIN STEM ( Iliamna Lake) 



LXATION: 59%^ '12" N. 153°58'06" W, 



PREVIOUS NAMES OR NUMBERS: DS 



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



PHYSICAL DESCRIPTION 



TOTAL LENGTH: 11.0 miles 



LENGTH ACCESSIBLE TO SAIJvlON: 11.0 miles 



AVERAGE WIDTH: 100' RANGE: 90'-200' 



AVERAGE DEPTH: hQ" RANGE: 24"- 120" 



TOTAL ACCESSIBLE SPAWNING AREA: 6^5,656 square yards (133.4 acres) 



POTENTIAL SPAWNING AREA: 37/0, 239,096 square yards (49.4 acres) 



BOTTOM QUALITY: Poor from mouth confluence of Chinkelyes Creek due to sand 

 bottom, \instable. Fair spawning facilities from Chinkelyes Creek to 

 forks, bottom fairly stable. Some sand and bedrock above Chinkelyes 

 Creek. 



WATERSHED: 201 square miles for entire system. A glacial valley parallel 

 to southeast shore of Pile Bay. River forks 11 miles from mouth. 

 Spruce, Cottonwood, alder, birch, and willow along stream. Subject 

 to frequent and sonetinies severe flooding. 



GRADIENT: 



WATER VELOCITY: 0.4 fps 



FLOW: 250 cfs (Sept. I8, I960). Measured RANGE: 

 at bridge, river level receding. 



AIR TEMPERATURE: 13.5° C. (Sept. I8, I960) 



WATER TEMPERATURE: 5.0° C. (Sept. I8, I960) 



POOLS AND RIFFLES: 



