USGS Water-Year Summary 2021
15302200 KOKTULI RIVER NEAR ILIAMNA, AK
LOCATION - Lat 59°47'36", long 155°31'21" referenced to North American Datum of 1927, in NW 1/4 NE 1/4 NE 1/4 sec.31, T.4 S., R.36 W., Lake and Peninsula Borough, AK, Hydrologic Unit 19030302, (Iliamna D-7 quad), on left bank, 15 mi upstream from the mouth of North Fork Koktuli R, and 21.5 mi northwest of Iliamna.
DRAINAGE AREA - 69.1 mi².
PERIOD OF RECORD - August 2004 to September 2015; August 2017 to present.
GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 775 ft above mean sea level, from topographic map.
PERIOD OF RECORD - June 2006 to September 2015; August 2017 to present.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: June 2006 to September 2015; August 2017 to present.
INSTRUMENTATION - Electronic water-temperature recorder set for 15-minute recording interval.
EXTREMES FOR PERIOD OF RECORD - WATER TEMPERATURE: Maximum recorded, 19.8°C, July 7, 2019. Minimum, 0.0°C, on many days during winter.