Changes in channel geomorphology of six eruption-affected tributaries of the Lewis River, 1980-82, Mount St. Helens, Washington
Open-File Report
84-614
By: H. A. Martinson, S. D. Finneran, and L. J. Topinka
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Abstract
The May 18, 1980, eruption of Mount St. Helens generated a lateral blast, lahars and tephra deposits that altered tributary channels in the Lewis River drainage basin. In order to assess potential flood hazards, study channel adjustments, and construct a sediment budget for the perturbed drainages on the east and southeast flanks of the volcano, channel cross sections were monumented and surveyed on Pine Creek, Muddy River, and Smith Creek during September and October of 1980. Additional cross sections were monumented and surveyed on Swift Creek, Bean Creek, and Clearwater Creek during the summer of 1981. The network of 88 channel cross sections has been resurveyed annually. Selected cross sections have been surveyed more frequently, following periods of higher flow. The repetitive cross-section surveys provide measurements of bank erosion or accretion and of channel erosion or aggradation. The report presents channel cross-section profiles constructed from the survey data collected during water years 1980-82. (USGS)
Suggested Citation
Martinson, H.A., Finneran, S.D., Topinka, L.J., 1984, Changes in channel geomorphology of six eruption-affected tributaries of the Lewis River, 1980-82, Mount St. Helens, Washington: U.S. Geological Survey Open-File Report 84-614, v, 113 p., https://doi.org/10.3133/ofr84614.
ISSN: 2331-1258 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Changes in channel geomorphology of six eruption-affected tributaries of the Lewis River, 1980-82, Mount St. Helens, Washington |
| Series title | Open-File Report |
| Series number | 84-614 |
| DOI | 10.3133/ofr84614 |
| Year Published | 1984 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | v, 113 p. |
| Country | United States |
| State | Washington |
| Other Geospatial | Lewis River, Mount St. Helens |