Fluvial processes and passive rehabilitation of the Lisbon Bottom side-channel chute, Lower Missouri River

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Abstract

Multiple large floods in 1993-1997 on the Lower Missouri River carved a side-channel chute through the river bottom at Lisbon, Missouri. Although similar in some respects to engineered side-channel chutes designed for habitat rehabilitation projects, the Lisbon Bottom chute has been unique in that it was allowed to evolve for more than four years with minimal stabilization. During the wet years, 1996-1999, the chute was subjected to abnormally high discharges and passed as much as 20% of the total discharge of the Missouri River. Relatively unrestrained fluvial processes during this time created a wide channel with highly diverse habitats. The upper one-half of the chute established a shallow, braided channel morphology similar to the pre-managed Missouri River. The lower half established a dynamically migrating, single-thread channel, and an incipient flood plain. Compared to the adjacent navigation channel, the chute established substantial areas of shallow, slow-velocity aquatic habitat that is considered to be in short supply in the present-day Lower Missouri River. The shortterm biological benefits have been mixed: the chute has fewer waterbird and benthic macroinvertebrate taxa than adjacent riverine habitats, but greater numbers of fish species compared to the navigation channel.

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Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title Fluvial processes and passive rehabilitation of the Lisbon Bottom side-channel chute, Lower Missouri River
Year Published 2001
Language English
Publisher American Geophysical Union
Publisher location Washington, D.C.
Contributing office(s) Columbia Environmental Research Center
Description 18 p.
Larger Work Type Book
Larger Work Subtype Monograph
Larger Work Title Geomorphic processes and riverine habitat
First page 199
Last page 216
Country United States
Other Geospatial Lower Missouri River - Lisbon Bottom