178 



G 10.0 SOUTHEAST CREEK (Gibraltar Lake) 



LOCATION: 59°19'5l+" N. 154°36'36" W. 



PREVIOUS NAMES OR NUMBERS: Aij-b 



U.S.G.S. MAP: Iliarana, 1:250,000; Iliamna B-5, 1:63,360 



PHYSICAL DESCRIPTION 



TOTAL LENGTH: 5.I miles 



LENGTH ACCESSIBLE TO SALMON: 5.I miles 



AVERAGE WIDTH: 20' RANGE: 6 '-20' 



AVERAGE DEPTH: 12" RANGE: 6"-2U" 



TOTAL ACCESSIBLE SPAWNING AREA: 60,Ol6 sqiJare yards (l2.4 acres) 



POTEOTIAL SPAWNING AREA: 36^, 21,780 square yards (I+.5 acres) 



BOTTOM QUALITY: 2?^ <l/8", 2?^ l/8"-3", 30^ 3"-12", I65& >12". Good 

 gravel in lower 3 miles, not known beyond 3 miles. Bottom fairly 

 stable . 



WATERSHED: l4 square miles. A glacial valley through open rolling hills, 

 Cottonwood, alder, and birch along stream. Soxirce: several small lakes. 



GRADIENT: 338 '/mile 



WATER VELOCITY: 2.0 fps 



FLOW: 32 cfs (Aug. 5, I962). Measured RANGE: 



just above mouth, normal summer flow. 



AIR TEMPERATURE: 23-0° C. (Aug. 5, I962) 



WATER TEMPERATURE: 11.0° C. (Aug. 5, I962) 



POOLS AND RIFFLES: 



