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Scope/Content: Abstract: Mohnton Dam was constructed in the mid 1800s to power an iron works mill. In the early 1900s the mill was decommissioned and the dam was converted for use as a public water supply. This second use ended in the 1970s, and the dam has remained unused since that time. The dam has caused severe sedimentation of the impoundment; dam removal will help restore the creek and allow for the passage of fish. Removal took expected in October 2006. The project included significant sediment management. Following the project, several heavy rain storms lead to a destabilization of the newly-created stream channel and banks. Furthermore, an unknown structure was uncovered in the stream channel near the top of the former impoundment that deflected flows against the newly-created banks, causing erosion. A plan for action has been developed by the dam removal engineering consultant and will be undertaken in the late winter/early spring of 2007. Details in this grant report are subject to change. Scope/Content: Author affiliation: American Rivers
Fisheries and fish passage Sediment and channel dynamics Dams Dam retirement