Record Display for the EPA National Library Catalog
RECORD NUMBER: 249 OF 1202
|OLS Field Name||OLS Field Data|
|Main Title||Estimated Loads of Suspended Sediment and Selected Trace Elements Transported Through the Clark Fork Basin, Montana, in Selected Periods Before and After the Breach of Milltown Dam (Water Years 1985-2009).|
|CORP Author||Geological Survey, Reston, VA.; Environmental Protection Agency, Washington, DC.|
|Additional Subjects||Sediment transport ; Trace elements ; Reservoirs ; Clark Fork Basin ; Water pollution sampling ; Hydrology ; Stream flow ; Gaging stations ; Dams ; Maps ; Superfund ; Remedial action ; Suspended sediments ; Montana ; Milltown Dam|
Milltown Reservoir is a National Priorities List Superfund site in the upper Clark Fork basin of western Montana where sediments enriched in trace elements from historical mining and ore processing have been deposited since the completion of Milltown Dam in 1908. Milltown Dam was breached on March 28, 2008, as part of Superfund remediation activities to remove the dam and excavate contaminated sediment that had accumulated in Milltown Reservoir. In preparation for the breach of Milltown Dam, permanent drawdown of Milltown Reservoir began on June 1, 2006, and lowered the water-surface elevation by about 10 to 12 feet. After the breach of Milltown Dam, the water-surface elevation was lowered an additional 17 feet.