author={Karen L. Bushaw-Newton and David D. Hart and James E. Pizzuto and James R. Thomson and Jennifer M. Egan and Jeffrey T. F. Ashley and Thomas E. Johnson and Richard J. Horwitz and Melissa Ann Keeley and Joy Lawrence and Donald F. Charles and Catherine M. Gatenby and Danielle A. Kreeger and Timothy L. Nightengale and Roger L. Thomas and David J. Velinsky},
  journal={JAWRA Journal of the American Water Resources Association},
ABSTRACT: Dam removal has been proposed as an effective method of river restoration, but few integrative studies have examined ecological responses to the removal of dams. In 1999, we initiated an interdisciplinary study to determine ecological responses to the removal of a 2 m high dam on lower Manatawny Creek in southeastern Pennsylvania. We used an integrative monitoring program to assess the physical, chemical, and biological responses to dam removal. Following removal in 2000, increased… 

Effects of removal of a small dam on downstream macroinvertebrate and algal assemblages in a Pennsylvania stream

The results and other studies of dam removal suggest that downstream sedimentation following dam removal can reduce densities of macroinvertebrates and benthic algae and may reduce benthi diversity, but for small dams such impacts may be relatively minor and will usually be temporary.

Downstream benthic responses to small dam removal in a coldwater stream

Increased awareness of the negative effects of dams combined with an aging dam infrastructure has led to an increase in dam removals. However, ecological responses of downstream biota to such actions

Fish and Benthic Macroinvertebrate Assemblage Response to Removal of a Partially Breached Lowhead Dam

Dam removal is an increasingly common restoration technique in lotic ecosystems. Potential dam removal benefits include improved aquatic organism passage, restoration of natural flow dynamics and a

Changes in benthic algal communities following construction of a run-of-river dam

  • N. WuT. Tang Q. Cai
  • Environmental Science
    Journal of the North American Benthological Society
  • 2009
Abstract Ecological responses to dam construction are poorly understood, especially for downstream benthic algal communities. We examined the responses of benthic algal communities in downstream

Associations between riffle development and aquatic biota following lowhead dam removal

It is shown that riffle habitat development can be an important mechanism related to restoring sensitive species and biological diversity following dam removal, and chemical water-quality parameters were implicated as potential biotic drivers.


The removal of the numerous ageing dams in the United States has become an important stream restoration technique. The extent to which the ecological damage done to streams by dams is reversed upon

Short-term effects of dam removal on macroinvertebrates in a Taiwan stream

Dam removal is an approach for restoring rivers. However, there are increasing concerns about the impact of removal on downstream biota. We examined the short-term responses of benthic

Coastal habitat and biological community response to dam removal on the Elwha River

Habitat diversity and heterogeneity play a fundamental role in structuring ecological communities. Dam emplacement and removal can fundamentally alter habitat characteristics, which in turn can

Fish Assemblage Response to a Small Dam Removal in the Eightmile River System, Connecticut, USA

It is concluded that dam removals can have positive benefits on fish assemblages by enhancing river connectivity and fluvial habitat availability and restoring river connectivity for fish movement.

Do the Fish Return? A Qualitative Assessment of Anadromous Pacific Salmonids' Upstream Movement After Dam Removal

Abstract Basic assumptions about the ecological effects of dam removal remain untested hypotheses. In this work, I move to address this by assessing the effectiveness of dam removal as a tool to



Undamming Rivers: A Review of the Ecological Impacts of Dam Removal

  • A. Bednarek
  • Environmental Science
    Environmental management
  • 2001
Although monitoring and dam removal studies are limited, a continued examination of the possible ecological impacts is important for quantifying the resistance and resilience of aquatic ecosystems.

Short-Term Changes in Channel Form and Macroinvertebrate Communities Following Low-Head Dam Removal

D dam removal caused relatively small and transient geomorphic and ecological changes in downstream reaches, and apparently rapid channel development to an equilibrium form within the impoundment, associated with both dam removal and the subsequent June flood.

Changes in the Habitat and Fish Community of the Milwaukee River, Wisconsin, Following Removal of the Woolen Mills Dam

Abstract We evaluated the response of fish habitat, biotic integrity, and populations of smallmouth bass Micropterus dolomieu and common carp Cyprinus carpio to the 1988 removal of the low-head

Dam Removal: Challenges and Opportunities for Ecological Research and River Restoration

Restoration is defined broadly as an effort to compensate for the negative effects of human activities on ecological systems by facilitating the establishment of natural components and regenerative processes, although it is acknowledged that these efforts rarely eliminate all human impacts.

Impoundments and the Decline of Freshwater Mussels: a Case Study of an Extinction Gradient

Abstract: One major factor leading to the imperilment of freshwater mussels ( Bivalvia, Unionidae) has been the large‐scale impoundment of rivers. We examined the distribution and abundance of

Exploring How Disturbance Is Transmitted Upstream: Going against the Flow

  • C. Pringle
  • Environmental Science
    Journal of the North American Benthological Society
  • 1997
Examples of how alterations to streams and rivers in their lower reaches can produce biophysical legacies in upstream reaches on levels from genes to ecosystems are considered.

Dams and downstream aquatic biodiversity: Potential food web consequences of hydrologic and geomorphic change

It is illustrated the ecological importance of alternating periods of low and high flow, of periodic bed scour, and of floodplain inundation and dewatering to regulate both the life cycles of river biota and species interactions in the food webs that sustain them.

Breaching of a Small Irrigation Dam in Oregon: A Case History

Abstract Dam removal or breaching (partial removal) is an increasingly common remedy for fish passage, habitat degradation, water quality, and other problems caused by dams in the United States. The

Effects of Dam Removal: An Approach to Sedimentation.

Abstract : In recent years hydraulic structures such as dams have been removed due to deterioration, increased maintenance cost or obsolescence. Investigation of the hydraulic, hydrologic, and

Environmental considerations for assessing dam removal alternatives for river restoration

Dam removal has received increasing attention over the last several years as a viable alternative to rehabilitation of unsafe dams and as an alternative for consideration as many hydroelectric dams