11*8 



I 288-9 GRANITE CREEK ( Iliamna Lake) 



LOCATION: 59 "25 '12" N. 154''30'06" W. 



PREVIOUS NAMES OR NUMBERS: B3 



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



PHYSICAL DESCRIPTION 



TOTAL LENGTH: 19-5 miles 



LENGTH ACCESSIBLE TO SALMON: Uncertain, 3-5 miles to first large lake 



AVERAGE WIDTH: 30' RANGE: 10 '-60' 



AVERAGE DEPTH: 20" RANGE: 12"-2J+" 



TOTAL ACCESSIBLE SPAWNING AREA: 3^3,156 square yards (70-9 acres) 



POTENTIAL SPAWNING AREA: <1^, kQk square yards (O.l acre) 



BOTTOM QUALITY: 10^ l/8"-3", 20^ 3"-12", 70^ >12". Spawning facilities 



limited to small scattered patches of gravel in lower 0.5 mile. Bottom 

 apparently stable . 



WATERSHED: 51 square miles. A narrow steep canyon cut through rolling hills. 

 Cottonwood and spruce near mouth, alder, birch, and tundra after first 

 mile. Evidence of considerable flooding and severe scouring. Source: 

 nvmierous lakes along main stem. 



GRADIENT: 49 '/mile 



WATER VELOCITY: 1.8 fps 



FLOW: 75 cfs (July 31, 1962). Measured RANGE: 

 just above mouth, normal summer flow. 



AIR TEMPERATURE: l8.5° C. (July 31, I962) 



WATER TEMPERATURE: 12.3° C. (July 31, I962) 



POOLS AND RIFFLES: 



