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Study Info & Process

Missouri River Basin

The Missouri River extends 2,619 miles from its source at Hell Roaring Creek and 2,321 miles from Three Forks, Montana where the Jefferson, Madison and Gallatin Rivers converge to the confluence with the Mississippi River near St. Louis, Missouri. The Missouri River is the longest River in the United States, draining one sixth of the country.

The Study Scope

The map below shows Pick-Sloan authorized dams in the Missouri River Basin - one possible view of infrastructure within the Study area.

Download Pick-Sloan authorized dams map [PDF]

Omnibus Appropriation Act of 2009, Title 1, Section 108

The Civil Works Planning Process

Principles and Guidelines

MRAPS follows the U. S. Army Corps of Engineer’s (Corps) Civil Works Planning Process — a six-step iterative process defined in the U.S. Water Resources Council's Economic and Environmental Principles and Guidelines for Water and Related Land Resources Implementation Studies.

Missouri River & the Tribes

A total of 29* Tribes have been identified whose lands, traditional territories and ancestral homelands are in the Missouri River Basin. The United States has a unique legal relationship with Tribal Governments as set forth in the U.S. Constitution, treaties, statutes, water rights, Executive Orders, and court decisions. Since the formation of the Union, the United States has recognized Tribes as sovereign nations within the Federal Government. The Federal Government has enacted numerous statutes and regulations that establish and define a trust relationship with Tribes.

Cultural Resources

The Missouri River Basin is rich in stories of diverse cultures. History documents some of these stories of past lives and lifestyles; yet historical accounts barely touch the sweep of time that humans have inhabited the Basin.

Sediment Resources

The distribution and transport of sediment within the Missouri River is important to the economy and environmental quality of the Missouri River Basin and the lower Mississippi River.

Draft List of Infrastructure

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The Corps Districts responsible for implementing MRAPS are developing an approach to the scope of the Study as authorized by the MRAPS legislation, which reads, in pertinent part, as follows: