Channel geometry and hydrologic data for six eruption-affected tributaries of the Lewis River, Mount St. Helens, Washington, water years 1983-84

H. A. Martinson; H.E. Hammond; W.W. Mast; P.D. Mango

doi:10.3133/ofr85631

Channel geometry and hydrologic data for six eruption-affected tributaries of the Lewis River, Mount St. Helens, Washington, water years 1983-84

Open-File Report 85-631

By: H. A. Martinson, H.E. Hammond, W.W. Mast, and P.D. Mango

https://doi.org/10.3133/ofr85631

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Abstract

The May 18, 1980, eruption of Mount St. Helens generated a lateral blast, lahars, and tephra deposits that altered stream channels in the Lewis River drainage basin. In order to assess potential flood hazards, monitor channel adjustments, and construct a sediment budget for disturbed 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 1981. This network of channel cross sections has been resurveyed annually. Selected cross sections have been surveyed more frequently, following periods of higher flow. Longitudinal stream profiles of the low-water thalweg and (or) water surfaces were surveyed periodically for selected short reaches of channel. Corresponding map views for these reaches were constructed using the survey data and aerial photographs. This report presents plots of channel cross-section profiles, longitudinal stream profiles, and channel maps constructed from survey data collected during water years 1983-84. (USGS)

Suggested Citation

Martinson, H.A., Hammond, H., Mast, W., and Mango, P., 1986, Channel geometry and hydrologic data for six eruption-affected tributaries of the Lewis River, Mount St. Helens, Washington, water years 1983-84: U.S. Geological Survey Open-File Report 85-631, v, 161 p. :ill., maps ;28 cm., https://doi.org/10.3133/ofr85631.

ISSN: 2331-1258 (online)

Additional publication details
Publication type	Report
Publication Subtype	USGS Numbered Series
Title	Channel geometry and hydrologic data for six eruption-affected tributaries of the Lewis River, Mount St. Helens, Washington, water years 1983-84
Series title	Open-File Report
Series number	85-631
DOI	10.3133/ofr85631
Year Published	1986
Language	ENGLISH
Publisher	U.S. Geological Survey,
Description	v, 161 p. :ill., maps ;28 cm.