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Summary
Pages 1-12

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From page 1...
... These channelization and bank stabilization projects fixed the river channel in place and supported a serviceable navigation channel from Sioux City, Iowa, downstream to the Mississippi River confluence near St. Louis.
From page 2...
... Discharges of sediment from these projects have prompted concerns regarding not only local water quality impacts, but also questions regarding delivery of sediments and nutrients to the Mississippi River delta and the northern Gulf of Mexico. One section of this report thus considers possible downstream effects on water quality into the northern Gulf of Mexico.
From page 3...
... The committee's full statement of task appears in Chapter 1. This Summary is organized in parallel with the chapters of this report and contains the following sections: Changes in Missouri River Sediment and Related Processes; Missouri River Governance and Programs for Sediment Management; Missouri River Sediment Management and Ecological Resources; Missouri River Sediment Management Alternatives and Opportunities; Missouri River Water Quality; and Future River Management Decisions.
From page 4...
... The Missouri River underwent a fundamental transformation during the mid-twentieth century. The mainstem and tributary dams, and the revetments and other river control structures built as part of the federal Bank Stabilization and Navigation Project, helped control floods, generate hydroelectric power, provide reliable water supplies, and support commercial navigation.
From page 5...
... More informed future Missouri River resource management decisions will benefit from a comprehensive and accessible Missouri River sediment database and sediment budget.
From page 6...
... The Corps and the USGS should extend their collaborative efforts and develop a detailed Missouri River sediment budget from the headwaters to the river's mouth, with provisions for continuing revisions and updates as new data become available. MISSOURI RIVER GOVERNANCE AND PROGRAMS FOR SEDIMENT MANAGEMENT This section provides background for understanding Missouri River governance, especially as it relates to management of sediment and related resources.
From page 7...
... MISSOURI RIVER SEDIMENT MANAGEMENT AND ECOLOGICAL RESOURCES Question 7 in this report's statement of task asked, "Are current Corps management strategies, restoration tools (e.g., channel widening, creation of chutes, shallow water habitat, etc.) and other activities adequate and comprehensive enough to address issues associated with sediment and nutrients in the system?
From page 8...
... Explicitly assess progress of relevant MRRP programs towards achieving the 2000/03 Biological Opinion goal of reducing jeopardy to the three listed species. Corps management strategies to address sediment and nutrient issues in the Missouri River are undertaken through multiple interdependent programs within the MRRP under their Biological Opinion compliance responsibilities as directed by the U.S.
From page 9...
... Given the uncertainties associated with outcomes from Corps of Engineers Emergent Sandbar Habitat and Shallow Water Habitat programs, it is possible that they may not meet requirements of the Biological Opinion to avoid jeopardizing the continued existence of the tern, plover, and sturgeon. The ESH and SWH programs, and the suite of new Missouri River system initiatives and studies, thus should formulate alternative actions that eventually may need to be implemented to increase the likelihood of endangered species recovery.
From page 10...
... Substantially increased contributions of sediment from large tributaries to the Missouri River downstream from Gavins Point Dam, such as the Kansas River, are unlikely under present sediment management rules because these rivers have their own large storage reservoirs. Implications for Coastal Louisiana Before 1900, the Missouri and lower Mississippi river system transported an estimated annual average of 400 million metric tons of sediment from the interior United States to coastal Louisiana.
From page 11...
... WATER QUALITY AND MISSOURI RIVER SEDIMENT MANAGEMENT Question 2 in this report's statement of task asked, "What is the significance of the Missouri River sediments to the gulf of Mexico hypoxia problem? " Question 5 in this report's statement of task asked, "What are the key environmental and economic considerations regarding nutrient loads and/or contaminants in Missouri River sediment?
From page 12...
... nutrient criteria guidance development process to achieve agreement among themselves and with the states on designated uses for the river, by river segment, to reflect requirements for native species. As a result of this effort, EPA should support states that revise their existing narrative criteria for the mainstem Missouri River in order to reflect requirements for native species, even if such separate narrative sediment and nutrient criteria are later replaced by numeric criteria.


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