N 2U.7 ELVA CREEK (Lake Nerka) 



LOCATION: 59*35'36"N. 159°03 '1+2" W. 

 PREVIOUS I^-ES OR NUMBERS: 



U.S.G.S. MAP: Goodnews, Alaska, 1:250,000, 1951 



PHYSICAL DESCRIPTION 



TOTAL LENGTH: 3-5 miles 



LENGTH ACCESSIBLE TO SAMON: 3 miles 



AVERAGE WIDTH: 15' RANGE: 10 '-35' 



AVERAGE DEPTH: 1?" RAMIE: l'-3-5' (Midstream) 



TOTAL ACCESSIBLE SPAWI^ING AREA: 5.U5 acres 



POTENTIAL SPAWNING AREA: 15^; 0.82 acre 



BOTTavl QUALITY: 30^ gravel, 50^ rubble, 10^ bovilder, and 10^ sand 



WATERSHED: 12.7 square miles. Drains Alpine LaJse through lateral moraine 

 of willow, alder, cottonwood, and sprtice. High falls approximately 3 

 miles upstresim. 



GRADIENT: 



WATER VELOCITY: Average =3-3 fp.s. 



Range = 2.5-^-0 ?P.s. 



FLOW: 92.3 cfs. ( JvOy 31, I960). High RANGE: 



water level. Flow station 200 feet 

 up frcm mo\ith. 



AIR TEMPERATURE: 12.2° C. (July 31, I960); 15-0° C. (Aug. 29, I962) 



WATER TEMPERATURE: 12. k° C. (Aug. 2^+, I962); 11.1° C. (July 31, 196o) 



POOLS AND RIFFIES: Several small deep pools. 



82 



