USGS Water-Year Summary 2024

15261000 COOPER CREEK AT MOUTH NEAR COOPER LANDING, AK

LOCATION - Lat 60°28'50", long 149°52'50" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.31, T.5 N., R.3 W., Kenai Peninsula Borough, AK, Hydrologic Unit 19020302, (Seward B-8 quad), on left bank, approximately 0.5 mi upstream from mouth, and 1.5 mi west of Cooper Landing.

DRAINAGE AREA - 16.8 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1957 to January 1965, August 1998 to current year.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 436.90 ft NAVD88. From October 1957 to January 1965, 0.4 mi upstream at different datum.

REMARKS - Since July 1959, entire flow from 31.8 mi² of drainage area has been regulated by dam at Cooper Lake outlet. Beginning July 20, 2015 flow is regulated by release from a siphon drain valve from Cooper Lake. An additional 8.0 mi² of the Stetson Creek drainage was diverted into Cooper Lake on July 20, 2015. No spilling since 1959 except for period May 1961 to October 1962. GOES satellite telemetry at station.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1998 to current year.

PERIOD OF DAILY RECORD - WATER TEMPERATURE: August 1998 to current year.

INSTRUMENTATION - Electronic water-temperature recorder set for 15-minute recording interval.

REMARKS - Records represent water temperature at the sensor within 0.2°C. Heavy shore ice occurs near the gage.

EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 16.2°C, August 13, 2019; minimum, 0.0°C on many days during winter periods.