Forest Service Pacific Northwest Region:
1980_GPNF_Mt. St Helens Blast in 1980
Forest Service Pacific Northwest Region:
1980s_Historic photo of the pumping barge in the early 80s to keep lake level low after the Mt St Helens eruption, photo by U.S. Forest Service.
Forest Service Pacific Northwest Region:
201710_Spirit Lake Tunnel Log Debris Barrier
Forest Service Pacific Northwest Region:
Log mat on Spirit Lake. The 1980 eruption and the associated massive landslide deposited enormous amounts of floating woody debris onto Spirit Lake.
Forest Service Pacific Northwest Region:
View of Spirit Lake from Forest Road 99.
Forest Service Pacific Northwest Region:
Spirit Lake South Shore
Forest Service Pacific Northwest Region:
Spirit Lake to the north from the pumice plain's Truman Trail
Forest Service Pacific Northwest Region:
Spirit Lake Panorama.
Forest Service Pacific Northwest Region:
2018_Pumice Plain site visit.
Forest Service Pacific Northwest Region:
2016_Comprehensive Tunnel Inspection Team
Forest Service Pacific Northwest Region:
20170927_Interagency Spirit Lake Tunnel Inspection
Forest Service Pacific Northwest Region:
Forest Supervisor Gina Owens welcomes the National Academy of Sciences committee to Mount St Helens National Volcanic Monument.
Forest Service Pacific Northwest Region:
Safety briefing and operational review the morning of the 2018 tunnel and intake gate inspection, photo by U.S. Forest Service.
Forest Service Pacific Northwest Region:
The Spirit Lake tunnel is an Occupational Safety and Health Administration (OSHA) permitted confined space, photo by U.S. Forest Service.
Forest Service Pacific Northwest Region:
U.S. Army Corps of Engineers and U.S. Forest Service engineers inspect the Spirit Lake tunnel after a 2018 repair
Forest Service Pacific Northwest Region:
2018_Emergency snow operations with helicopter at Spirit Lake.
Forest Service Pacific Northwest Region:
201806_USFS_GiffordPinchot_Hydrologist reviewing data on the pumice plain. Photo by Johna Hogervorst, Forest Service employee
Forest Service Pacific Northwest Region:
USFS Engineers Take Groundwater Readings 2017
Forest Service Pacific Northwest Region:
2019 Colorado School of Mines
Forest Service Pacific Northwest Region:
Colorado School of Mines Geophysical Survey Team 2018
Forest Service Pacific Northwest Region:
20190517_MSHNVM_ColoradoSchool of Mines
Forest Service Pacific Northwest Region:
20180418_Employee monitoring historic drill casings photo shows erosion since the 1980s.
Forest Service Pacific Northwest Region:
Regional hydrologists and soil scientist make field visit to the pumice plain and debris blockage 2018, USFS photo.
Forest Service Pacific Northwest Region:
The sediment retention structure and upstream sediment plain on the North Fork Toutle River, courtesy US Army Corps of Engineers.
Forest Service Pacific Northwest Region:
20190813_SpiritLakeTunnelOutlet_HailuGabrielCivilEngineer_specialradioantenna
Forest Service Pacific Northwest Region:
201908_Engineers in Spirit Lake Tunnel during an inspection in August 2019
Forest Service Pacific Northwest Region:
View of the Toutle River and Mt Margaret from the Coldwater Science and Learning Center in the Mt St Helens National Volcanic Monument on the Gifford Pinchot National Forest in Washington's Cascades.
Forest Service Pacific Northwest Region:
20180809 _Stream bed from Mount St. Helens crater to Spirit Lake by Duane Bishop
Forest Service Pacific Northwest Region:
View of Mount St. Helens from Truman Trail
Forest Service Pacific Northwest Region:
Spirit Lake and floating log mat distributed around the lake with Harry’s Ridge in the distant foreground
