USGS Water-Year Summary for Site 11503000

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	Available Parameters
	00010 Temperature, water(Mean,Max.,Min.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Mean,Min.)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

11503000 ANNIE SPRING NEAR CRATER LAKE, OR

Pacific Northwest volcanic-rock aquifers

LOCATION - Lat 42°52'18", long 122°10'04" referenced to North American Datum of 1927, Klamath County, OR, Hydrologic Unit 18010203, in Crater Lake National Park and at highway bridge 0.1 mi downstream from source.

DRAINAGE AREA - Indeterminate, normal flow is entirely from Annie Spring.

SURFACE-WATER RECORDS

PERIOD OF RECORD - June 1977 to September 2004, August 2010 to current year. Discharge measurement and fragmentary gage-height record August to October 1913. Discharge measurements only Oct. 11, 1967, June 26, Sept. 13, 1968.

GAGE - Water-stage recorder, crest-stage gage, and V-notch sharp-crested weir. Datum of gage is 5,982.65 ft above NGVD of 1929 (National Park Service bench mark).

REMARKS - Fluctuations caused by pumps 0.1 mi upstream. Small diversion by National Park Service 0.1 mi upstream. Computation of monthly and annual adjusted flows discontinued water year 2014.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 18 ft³/s July 6, 1984, gage height, 1.56 ft; maximum gage height, 3.69 ft occured sometime in June 2003, from high-water mark, possible snow and ice jam, discharge not determined; minimum daily discharge, 0.23 ft³/s Mar. 14, 16-31, Apr. 1, 2002.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: February 2023 to current year.

WATER TEMPERATURE: February 2023 to current year.

INSTRUMENTATION - Water-quality monitor.

EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: Maximum, 55 microsiemens Apr. 4, 2023; minimum, 41 microsiemens July 1-3, 6-8, 10, 11, 2023.

WATER TEMPERATURE: Maximum, 3.2°C Aug. 13-15, Sept. 6-10, 12-16, 2023; minimum, 0.2°C Mar. 30, 2023.