13U 

 I 217.1 COPPER RIVER (Iliamna Lake) 



LOCATION: 59'*31'30" N. 154°31'00" W. 



PREVIOUS NAMES OR NUMBERS: C3 



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



PHYSICAL DESCRIPTION 



TOTAL LENGTH: 32.0 miles 



LENGTH ACCESSIBLE TO SAmON: 12.0 miles 



AVERAGE WIDTH: 70 ' RANGE: 50'-120' 



AVERAGE DEPTH: 2^+" RANGE: l8"-lI+U" 



TOTAL ACCESSIBLE SPAWNING AREA: 1+93,680 square yards (102.0 acres) 



POTENTIAL SPAWNING AREA: 66^, 325,732 square yards (67.3 acres) 



BOTTOM QUALITY: 1$ <l/8", 61$ l/8"-3", 26^ 3"- 12", 6^ >12". Excellent 

 spawning facilities in lover 6 miles, some suitable area from 6 miles 

 to falls. Bottom stable. Bottom above falls nonspavnable due to 

 rubble and bedrock. 



WATERSHED: 128 square miles. A stream- cut valley throxjgh rolling hills, 

 dense vdllow, alder, and birch thickets along stream, spruce forest on 

 hills . Source: meadow lake . A 32 ' falls 12 miles from mouth im- 

 passable . 



GRADIENT: 17' /mile below falls 



WATER VELOCITY: 3.2 fps (Aug. I96I, average of 9 observations) 



FLOW: U80 cfs (Sept. k, I961) . Measured RANGE: 

 6 miles from falls, water level 

 receding. 



AIR TEMPERATURE: 



WATER TEMPERATURE: 12.7° C. (A\ag. I96I, average of 27 observations) 



POOLS AND RIFFIES: 



