USGS Water-Year Summary for Site 14240304

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	62614 Elevation, lake/res, NGVD29(Obs.)

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Water year 2024: 2023-10-01 to 2024-09-30

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USGS Water-Year Summary 2024

14240304 SPIRIT LAKE AT TUNNEL, AT SPIRIT LAKE, WA

LOCATION - Lat 46°16'35", long 122°09'41" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 sec.10, T.9 N., R.5 E., Skamania County, WA, Hydrologic Unit 17080005, Mount St. Helens National Volcanic Monument, at entrance of Spirit Lake Outlet Tunnel, 5.6 mi north-northeast of the Mount St. Helens volcanic edifice.

DRAINAGE AREA - 18 mi². at entrance to Spirit Lake Outlet Tunnel. Prior to the volcanic eruption on May 18, 1980, 14.9 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1987 to current year. Records of contents published in WDR-WA-94-1 are unreliable and should not be used.

GAGE - Water-stage recorder. Datum of gage is 3,400.00 ft above National Geodetic Vertical Datum of 1929; gage readings have been reduced to elevations above National Geodetic Vertical Datum of 1929. To convert to North American Vertical Datum of 1988, add 4.46 ft (USGS Level 2 GNSS survey as per USGS T&M 11-D1).

REMARKS -

As a result of the May 18, 1980, eruption of Mt St Helens, a gravitational landslide ensued, transporting an estimated 0.6 mi3 of debris into the upper North Toutle River drainage basin. A massive debris avalanche completely filled the lake, blocking the natural outlet to the North Fork Toutle River with a deposit several hundred feet thick. This filling caused the lake to rise 200 ft to elevation 3,400 ft. Refer to report by Schuster, R.L., ed., 1986, Landslide Dams: Processes, Risk and Mitigation: Geotechnical Special Publication no. 3, American Society of Civil Engineers, 164 p., for history of Spirit Lake as it was impacted by the eruption and actions taken to reduce the resulting flood threat. U.S. Geological Survey satellite telemeter at station.

-Extremes for WY2017: Maximum elevation, 3447.66 ft., June 2; minimum elevation 3441.16 ft., Aug. 29.

-Extremes for WY2018: Maximum elevation, 3443.92 ft., May 16; minimum elevation 3439.14 ft., Sept. 5.

-Extremes for WY2019: Maximum elevation, 3445.45 ft., Aug. 13; minimum elevation 3439.69 ft., Oct. 2.

-Extremes for WY2020: Maximum elevation, 3446.48 ft., Feb. 10; minimum elevation 3440.12 ft., Sept. 22.

-Extremes for WY2021: Maximum elevation, 3445.17 ft., June 5; minimum elevation 3440.33 ft., Oct 9.

EXTREMES FOR PERIOD OF RECORD - Maximum recorded elevation, 3,460.13 ft Feb. 5, 1997; minimum recorded elevation, 3,437.00 ft Oct. 28, 1987.