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Spirit Lake
Aerial view of the lake in 2005
Spirit LakeLocation in Washington stateShow map of Washington (state)Spirit LakeSpirit Lake (the United States)Show map of the United States
Location	Mount St. Helens National Volcanic Monument, Skamania County, Washington, U.S.
Coordinates	46°16′23″N 122°08′06″W / 46.27306°N 122.13500°W / 46.27306; -122.13500
Primary inflows	Precipitation, streams
Primary outflows	Drainage tunnel to South Coldwater Creek
Basin countries	United States
Surface elevation	3,406 feet (1,038 m) (3,198 ft (975 m) before May 18, 1980)

Spirit Lake is a lake in Skamania County, Washington, United States, located north of Mount St. Helens. It was a popular tourist destination for many years until Mount St. Helens erupted in 1980. Previously there had been six camps on the shore of Spirit Lake: Boy Scout (Camp Spirit Lake), the Girl Scout Camp at Spirit Lake, two YMCA camps (Camp Loowit, and Portland YMCA camp), Harmony Fall Lodge, and another for the general public. There were also several lodges accessible to visitors, including Spirit Lake Lodge and Mt. St. Helens Lodge. The latter was owned and operated by Harry R. Truman, a noted victim of the volcano's 1980 eruption.

Human history

The body of water was named "Spirit" by settlers after histories from Native American people in the area spoke of haunting spirits at the lake. The spirits, telling a story of life and death, formed out of the mists into various shapes of trees and animals, foretelling impending doom but good fortune in the afterlife. Any person who saw the apparitions were dead within a week.

A post office named Spirit Lake existed for a brief time, renamed to "Lange" in 1910 after the postmaster. Early mining around the lake began at the turn of the 20th century and necessitated the first road to the area in 1901, replacing a treacherous trail considered unfit for wagons.

Geologic history

Prior to 1980, Spirit Lake consisted of two arms that occupied what had been the valleys of the North Fork Toutle River and a tributary. About 4,000 years ago, these valleys were blocked by lahars and pyroclastic flow deposits from Mount St. Helens to form the pre-1980 Spirit Lake. The longest branch of Spirit Lake was about 2.1 miles (3.4 km) long. A stable outlet channel flowed from the lake to the North Fork Toutle River across a natural dam composed of volcanic material. The level of Spirit Lake remained basically stable, at an altitude of about 3,198 ft (970 m).

1980 Mount St. Helens eruption

During the May 18, 1980 eruption of Mount St. Helens, Spirit Lake received the full impact of the lateral blast from the volcano. The blast and the debris avalanche associated with this eruption temporarily displaced much of the lake from its bed and forced lake waters as a wave as much as 850 ft (260 m) above lake level on the mountain slopes along the north shoreline of the lake. The debris avalanche deposited about 430,000,000 cubic metres (350,000 acre⋅ft) of pyrolized trees, other plant material, volcanic ash, and volcanic debris of various origins into Spirit Lake. The deposition of this volcanic material decreased the lake volume by approximately 56,000,000 cubic metres (45,000 acre⋅ft).

Lahar and pyroclastic-flow deposits from the eruption blocked its natural pre-eruption outlet to the North Fork Toutle River valley at its outlet, raising the surface elevation of the lake by between 197 ft (60 m) and 206 ft (63 m). The surface area of the lake was increased from 1,300 acres to about 2,200 acres and its maximum depth decreased from 190 ft (58 m) to 110 ft (34 m). The eruption tore thousands of trees from the surrounding hillsides and swept them into Spirit Lake. These thousands of shattered trees formed a floating log raft on the lake surface that covered about 40% of the lake's surface after the eruption.

After the eruption, Spirit Lake contained highly toxic water with volcanic gases seeping up from the lake bed. A month after the eruption, the bacteria-carrying water was devoid of oxygen. Scientists predicted that the lake would not recover quickly, but the reemergence of phytoplankton starting in 1983 began to restore oxygen levels. Amphibians such as frogs and salamanders recolonized the lake, and fish (reintroduced by fishermen) thrived.

Water levels

The water level of Spirit Lake is maintained at about 3,406 ft (1,040 m) by draining water through Spirit Lake Outlet Tunnel, a gravity-feed tunnel completed in 1985. The 8,465-foot-long (2,580 m) tunnel was cut through Harrys Ridge to South Coldwater Creek, which flows to Coldwater Lake and into the North Fork of the Toutle River. Had the lake level not been stabilized, the dam, which was composed of volcanic avalanche debris created by the 1980 eruption, would have been breached and caused catastrophic flooding within the Toutle River Valley.

An attempt to upgrade and repair the 1985 tunnel began in 2021 but was halted due to concerns over damages to the pumice plain. The project restarted in 2024 and a temporary road, following the prior access path to the lake, will be rebuilt with future work to involve the installation of gates to the tunnel and dredging to prevent the buildup of logs. During the efforts planned through 2027, several trails surrounding the area will no longer be accessible during weekdays.

Climate

Pre-eruption weather data from the Spirit Lake Ranger Station indicates the area either had the rare dry-summer variant of the subarctic climate (Köppen climate classification: Dsc), or the rare cold-summer mediterranean climate (Köppen climate classification: Csc), both of which are found only in small areas across the world. Recent climate data for the area is not available to confirm whether the post-eruption site still has either one of these rare climate types.

Gallery

• Spirit Lake prior to 1980
• Spirit Lake filled with debris from the eruption. October 4, 1980
• Logs covering Spirit Lake, 2009
• Spirit Lake
• Tree mats on Spirit Lake, 2012
• Spirit Lake with tree mats and Mount St. Helens
• Shows the major changes in hydrology of Mount St. Helens after its 1980 eruption, including artificial modifications designed to mitigate sediment and water flow.
• View above Spirit Lake

References

1. ^ Anonymous (2013) USGS Cascades Volcano Observatory: Spirit Lake. Mount St. Helens, Cascades Volcano Observatory.
2. ^ Meyer, W, and PJ Carpenter (1983) Filling of Spirit Lake, Washington. Open-File Report no. 82-771. U.S. Geological Survey, Reston, Virginia.
3. "40-Years Ago Today: Spirit Lake BSA Camp Destroyed by Mount St. Helens Eruption". Cascade Pacific Council. 2020-05-18.
4. "Camp Loowit History". Camp Loowit.
5. Anderson, DA (2013). Mount St. Helens. San Francisco, California: Arcadia Publishing. ISBN 9781467130554.
6. "A Wonderful Spirit Lake". The Yakima Herald. June 21, 1900. p. 4. Retrieved July 18, 2024.
7. "Spirit Lake Fame Grows". The Daily Chronicle. June 6, 1953. p. 6D. Retrieved July 18, 2024.
8. "Untitled". The Chehalis Bee-Nugget. August 30, 1901. p. 9. Retrieved July 18, 2024. See third column, last paragraph
9. "For A Road To The Mines". The Chehalis Bee-Nugget. October 25, 1901. p. 9. Retrieved July 18, 2024.
10. Hopson, CA (2008) Geologic Map of Mount St. Helens, Washington Prior to the 1980 Eruption. Scale 1:62,500, Open-File Report no. 2002-468. U.S. Geological Survey, Reston, Virginia.
11. Lipman, PW., and DR Mullineaux, eds. (1981) The 1980 eruptions of Mount St. Helens, Washington. Professional Paper no. 1250. U.S. Geological Survey, Reston, Virginia. 844 pp.
12. Lee DB (1993) Effects of the Eruptions of Mount St. Helens on Physical, Chemical, and Biological Characteristics of Surface Water, Ground Water, and Precipitation in the Western United States. Water-Supply Paper no. 2438. U.S. Geological Survey, Reston, Virginia.
13. Dale, VH, FJ Swanson, and CM Crisafulli, eds. (2005) Ecological Responses to the 1980 Eruption of Mount St. Helens. Springer Science+Business Media, Inc., New York, New York, 342 pp. ISBN 978-0387238500
14. ^ Larson, D (1993) The Recovery of Spirit Lake. American Scientist. 81(2):166-177.
15. Swift, CH, and DL Kresch (1983) Mudflow hazards along the Toutle and Cowlitz Rivers from a hypothetical failure of Spirit Lake blockage. Water-Resources Investigations Report no. 82-4125. U.S. Geological Survey, Reston, Virginia.
16. Kresch, DL (1992) Development and routing of mudflow resulting from hypothetical failure of Spirit Lake debris dam, Washington. Water-Resources Investigations Report no. 91-4028. U.S. Geological Survey, Reston, Virginia.
17. Fredlund, Diana. "Mountain on the move Spirit Lake Outlet Tunnel team plans to repair movement to tunnel floor" (PDF). US Forest Service. US Army Corps of Engineers. Retrieved 3 November 2016.
18. Atkinson, Minka. "Some Mount St. Helens trails will close on weekdays through 2027". The Seattle Times. The Daily News (Longview, Washington). Retrieved May 22, 2024.
19. "SPIRIT LAKE RS, WA (457919)". Western Regional Climate Center. Retrieved November 26, 2015.

External links

• Anonymous, (2006) CVO Photo Archives: Hydrology and Hydrologic Monitoring Images. Cascades Volcano Observatory, United States Geological Survey, Vancouver, Washington.
• Glicken, HX, W Meyer, and MA Sabol, (1989) Geology and ground-water hydrology of Spirit Lake blockage, Mount St. Helens, Washington, with implications for lake retention. Bulletin no. 1789. U.S. Geological Survey, Reston, Virginia.
• Evarts, RC, and RP Ashley (1993a) Geologic map of the Spirit Lake East quadrangle, Skamania County, Washington. scale 1:24,000, Geologic Quadrangle no. 1679, U.S. Geological Survey, Reston, Virginia.
• Evarts, RC, and RP Ashley (1993b) Geologic map of the Spirit Lake West quadrangle, Skamania County, Washington. scale 1:24,000, Geologic Quadrangle no. 1681, U.S. Geological Survey, Reston, Virginia.
• Patton, V (2007) Ecological Mysteries of Spirit Lake Documentary produced by Oregon Field Guide, Oregon Public Broadcasting.

• Lakes of Washington (state)
• Lakes of Skamania County, Washington
• Mount St. Helens
• Gifford Pinchot National Forest