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This data release consists of tables with the thickness and particle-size characteristics of overbank sediment deposited in May 1978 along the valley of Powder River in southeastern Montana. About 900 sediment samples were collected at regularly-spaced distances from 20 valley transects along a 90-kilometer reach of Powder River between Moorhead and Broadus, Montana. The decrease in sediment thickness and particle size with distance from the main channel showed weak trends, which were caused by the variability introduced by vegetation sediment traps and subsidiary channels.
This data release will consist of 40 Excel files (one file for each cross section) containing worksheets corresponding to each channel cross-section survey (from 2 to about 40). Worksheets contain the basic survey data (dates, equipment, reference elevations, foresights, distances from reference pins, and elevations). First release: August 21, 2017 (available from author) Revised: November 2, 2018 (ver. 2.0 - available from author) Revised: August 28, 2020 (ver 3.0)


    map background search result map search result map Channel Cross-section Data for Powder River between Moorhead and Broadus, Montana from 1975 to 2019 (ver. 3.0, August 2020) Thickness and characteristics of overbank sediment deposited during an extreme flood in May 1978 along Powder River, Montana, USA Channel Cross-section Data for Powder River between Moorhead and Broadus, Montana from 1975 to 2019 (ver. 3.0, August 2020) Thickness and characteristics of overbank sediment deposited during an extreme flood in May 1978 along Powder River, Montana, USA