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Text / Sediment Management for the Milltown Dam Removal: An HEC-6 Modeling Approach

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Sediment Management for the Milltown Dam Removal: An HEC-6 Modeling Approach
Alternative Title
Managing Watersheds for Human and Natural Impacts: Engineering, Ecological, and Economic Challenges, EWRI and ASCE 2005 Watershed Management Conference, Williamsburg, Virginia, July 19-22, 2005
Christopher R. Goodell
Dale Evans
Jeffrey B. Bradley
West Consultants, Inc.
Date Created and/or Issued
Contributing Institution
UC Riverside, Library, Water Resources Collections and Archives
Clearinghouse for Dam Removal Information (CDRI)
Rights Information
Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user.
Scope/Content: Abstract: Milltown dam is located on the Clark Fork just upstream of Missoula, Montana and is proposed to be removed in the next few years. This paper addresses the sediment impacts of implementing the "river-erosion" alternative of removing deposited sediments from behind the dam. A number of different alternatives for managing the sediment during dam removal were analyzed. This paper discusses the so-called "Scenario 8" alternative. The "Scenario 8" alternative looks at a relatively fast drawdown with the use of a bypass channel in the reservoir to divert river flow away from the contaminated sediment in the lower reservoir. This alternative will prevent most of the contaminated sediments from transporting downstream, but will require some mechanical removal. HEC-6 is used to model the amount of sediment scoured, the concentration of suspended sediment at the dam site, and the sediment deposition and dilution in the reach just below the dam. The appropriateness of modeling the sediment impacts of a run-of-river dam removal using HEC-6 is also discussed.
digital copy
Sediment and channel dynamics
Dam retirement
Clark Fork, MT
Milltown Dam

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