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Prior to 1900, the Missouri River
channel was uncontrolled. It
was free to meander back and forth across the river valley with the
associated erosion, avulsion, deposition, and accretion.
The river continually eroded the banks and deposited the eroded
material in new locations to form bars, shoals, and new banks
downstream.
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At
all times, the channel occupied roughly 300,000 acres and consisted of
numerous islands, channels, chutes, sandbars, and slack water supporting
vegetation in various stages of succession.
This vegetation reflected the natural processes of erosion and
deposition and consisted primarily of willow and cottonwood.
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. Efforts
to stabilize the Missouri River and provide a navigation channel started
in the early 1900's.
Since 1912, seven separate acts of Congress provided for the
construction and maintenance of a navigation channel and bank
stabilization works.
The collection of projects, constructed and maintained by the US
Army Corps of Engineers, is known as the Missouri
River Bank
Stabilization and Navigation Project,
(BSNP).
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The
BSNP projects included placing revetments on the riverbanks, closing off
sloughs and side channels and constructing pile dikes.
Later work included dredging and rock dike construction.
Construction and long-term operation and maintenance of the BSNP
created an inland navigation system and provided many benefits such as
protecting utilities, transportation networks, bridges, and adjacent
landowners and farms.
Bank
Stabilization Graphic
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However,
the highly controlled, narrow channel has significantly reduced
the amount of fish and wildlife habitat that used to be supported from
the natural channel and meander belt.
Consequently, the fish and wildlife populations have seen a
significant reduction along with the loss of recreational opportunities
that they used to provide.
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In
the early 1980's, the Kansas City District of the US Army Corps of
Engineers completed a study of the feasibility of the Missouri River
Mitigation Project.
This study was conducted under the authorization of the 1958 Fish
and Wildlife Coordination Act (Public Law 85-624).
The study determined that it was economically feasible to
mitigate fish and wildlife resources lost to the construction of the
BSNP project and enhancing fish and wildlife resources.
In 1986, Congress
authorized construction
of the Mitigation project.
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