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Scope/Content: Abstract: This study was a followup to baseline and post-dam removal studies in Manatawny Creek, near Pottstown, Pennsylvania. Designed to assess longer-term effects of dam removal, the study employed a modified Before-After- Control Impact (BACI) approach to determine how geomorphology and fish, macroinvertebrate and algal assemblages responded to dam removal. The geomorphology assessment showed that bed elevation downstream of the dam had been raised by deposition, but the deposited sediment appeared to be removed by 2005. Bed elevations were stable upstream of the dam. Algal biomass, diatom species richness, macroinvertebrate density and density of several fishes decreased significantly downstream from the dam 12 months after removal. Downstream diatom assemblage composition remained similar to the upstream control site. Algal metrics in 2004 and 2005 were similar to those prior to dam removal. Densities of macroinvertebrates and several fishes decreased significantly between pre-removal stages and 2004, but not between pre-removal stages and 2005. Dam removal had no significant effect on macroinvertebrate taxa richness, EPT richness, and HBI scores in any year. Several species of fish showed changes in fish distribution attributable to changes in habitat in the former impoundment and increased fish passage due to the dam removal Scope/Content: Author affiliation: Patrick Center for Environmental Research
Ecology and river restoration Sediment and channel dynamics Dams Dam retirement