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Gage house at Coldwater Lake
-- USGS Photo by Lyn Topinka, October 1, 1982

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Gage house at Tower Road with telemetry equipment
-- USGS Photo by Lyn Topinka, September 3, 1985

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PS69 sampler in gage house at Tower Road
-- USGS Photo by Lyn Topinka, September 3, 1985

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Dynatrol and PS69 sampler in gage house at Tower Road
-- USGS Photo by Lyn Topinka, June 2, 1987

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Sediment sampling from bridge structure
-- USGS Photo by Lyn Topinka, June 2, 1987

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Toutle River-2 Bedload Sampler
-- USGS Photo by Lyn Topinka, May 7, 1987

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Toutle River-2 Bedload Sampler (left) and Chinese Bedload Sampler (blue).
-- USGS Photo by Lyn Topinka, May 7, 1987

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Stream gaging with tag line
-- USGS Photo by Lyn Topinka, April 27, 1985

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River channel cross-section surveying - view here is of the North Fork Toutle River drainage, on north side of Mount St. Helens. Drainage has eroded into the blast deposits.
-- USGS Photo by Lyn Topinka

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River channel cross-section surveying - view here is at Pine Creek drainage, on south side of the volcano's base. Ash covers the ground surface. Mount St. Helens is in the distance.
-- USGS Photo by Lyn Topinka

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River channel cross-section surveying - view here is along the Muddy River drainage, approximately one mile (1.5 kilometers) southeast of the volcano's base. Rod person (lower left) and instrument persons (upper right) give scale.
-- USGS Photo by Lyn Topinka, June 26, 1981

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Aerial view, Spirit Lake pump station. From late 1982 through the spring of 1985, a pump station operated at Spirit Lake to maintain that lake at a safe level. Without pumping, Spirit Lake was estimated to overtop its debris dam within a year.
-- USGS Photo by Lyn Topinka, September 23, 1983

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In the spring of 1985 a permanent tunnel was opened, allowing water to drain out of the lake safely. This tunnel is 11 feet (3.4 m) in diameter and more than 1.5 miles (2.5 km) in length. The water level of Spirit Lake is now maintained at approximately 100 feet (30 m) below the estimated overtopping level.
-- USGS Photo by Lyn Topinka, October 2, 1986

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Two USGS scientists (yellow circle) use a boat to take water samples from Spirit Lake in 1981. Logs and debris covered most of the surface of Spirit Lake.
-- USGS Photo by Lyn Topinka, July 16, 1981

CVO Photo Archives - Hydrology

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