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lake from flowing over the blockage, while at the same time the lake was cleared of the numerous downed trees that were blown into the lake by the eruption explosion. In 1991, rainbow trout appeared in the lake, apparently resulting from the migration of stock introduced to
Coldwater Lake a few years earlier. The trout of Castle Lake are a self-perpetuating population, successfully spawning in the streams that feed Castle Lake.
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328:, the probability of such a breach was considered very low. However, the conditions which created the dam are unprecedented, and therefore little to no historical data exists to support any conclusion regarding stability. The blockage appears to be stable regarding overtopping erosion, but the susceptibility to earthquake or hydrologic events remains undetermined.
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The lake filled rapidly during the winter of 1980–1981, and was expected to overflow the blockage in the fall of 1982. However, a subsequent study predicted an earlier overflow, so in
October 1981 a spillway 270 meters (890 ft) long and 30 meters (98 ft) wide was constructed to prevent the
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When Mount St. Helens erupted on May 18, 1980, debris from an avalanche measuring 2.5 cubic kilometers blocked South Fork Castle Creek, creating a lake as runoff was impeded by the resulting debris wall which was 20 meters (66 ft) in height. The blockage of Castle Creek measures 610 meters
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trail number 221, called the Castle Lake Trail. The trail-head splits from Castle Ridge Trail #216 and runs for 3.9 miles (6.3 km) to Castle Lake. The hiking distance from Toutle, Washington is 18.6 miles (29.9 km). Trout fishing is seasonally accessible and allowed.
248:. The lake covers just slightly more than 1 square kilometer (0.39 sq mi). In 1981 a spillway was constructed to alleviate concerns about sudden erosion. The lake is difficult to access, but trails have been built to it and recreational fishing is allowed.
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There has been significant concern that despite the spillway construction, the debris blockage that created Castle Lake could erode suddenly, and create a flood posing significant risks to the communities of
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Castle Lake is a sub-alpine lake covering an area of just over 1 square kilometer (0.39 sq mi), located 9 kilometers (5.6 mi) northwest of Mount St. Helens. Castle Lake's outflow runs towards
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278:(2,000 ft) long with a mean width of 430 meters (1,410 ft).
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423:"Bathymetric Map and Area/Capacity Table for Castle Lake, Washington"
449:"Mount St. Helens (FAQ 10) How were fish affected by the eruption?"
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513:. Coos Bay, Oregon. June 8, 1990 – via newspapers.com.
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21,000,000 cubic metres (740,000,000 cu ft)
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356:. United States Geological Survey. July 12, 1979
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33:Castle Lake viewed from the air, February 2016
478:"Lakes and Drainages Around Mount St. Helens"
421:Mosbrucker, Adam R.; Spicer, Kurt R. (2017).
244:, when an avalanche dammed the South Fork of
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387:. Washington Department of Fish and Wildlife
590:. Salem, Oregon – via newspapers.com.
507:"Mount St. Helens trail program ambitious"
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16:Barrier lake in Washington, US
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453:United States Forest Service
326:United States Forest Service
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610:Lakes of Washington (state)
531:"Mount Saint Helens Trails"
320:. In a study conducted by
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184:257.7 acres (1.043 km)
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151:South Fork Castle Creek
138:South Fork Castle Creek
615:Landslide-dammed lakes
482:U.S. Geological Survey
104:46.25028°N 122.27500°W
109:46.25028; -122.27500
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484:. February 7, 2013
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246:Castle Creek
238:barrier lake
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205:Water volume
181:Surface area
125:barrier lake
306:Castle Rock
252:Description
234:Castle Lake
107: /
95:122°16′30″W
82:Coordinates
58:Castle Lake
22:Castle Lake
604:Categories
332:References
286:Recreation
225:References
197:Max. depth
92:46°15′01″N
557:AllTrails
511:The World
263:andesitic
562:June 28,
537:June 28,
488:June 28,
459:June 28,
391:June 28,
360:June 28,
314:Longview
70:Location
273:History
267:dacitic
318:Toutle
316:, and
426:(PDF)
310:Kelso
236:is a
167:Basin
564:2018
539:2018
490:2018
461:2018
393:2018
362:2018
265:and
121:Type
76:, US
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
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