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Landscape context and the biophysical response of rivers to dam removal in the United States Abstract Dams have been a fundamental part of the U.S. national agenda over the past two hundred years. Recently, however, dam removal has emerged as a strategy for addressing aging, obsolete infrastructure and more than 1,100 dams have been removed since the 1970s. However, only 130 of these removals had any ecological or geomorphic assessments, and fewer than half of those included before- and after-removal (BAR) studies. In addition, this growing, but limited collection of dam-removal studies is limited to distinct landscape settings. We conducted a meta-analysis to compare the landscape context of existing and removed dams and assessed the biophysical responses to dam removal for 63 BAR studies. The highest... Categories: Publication; Types: Citation Final Report: Projecting Future Climate Effects on Cottonwood and Willow Seed Dispersal and Tree Regeneration in Western Riparian Forests Categories: Publication; Types: Citation; Tags: Climate data, Forests, Landscapes, North Central CASC, Plants, All tags... Rivers, Streams and Lakes, Seed dispersal phenology, Snowpack/snowmelt, South Platte River Basin, Streamflow hydrology, Water, Coasts and Ice, Wildlife and Plants, cottonwood, riparian vegetation, willow, Fewer tags Dam removal: Listening in Abstract Dam removal is widely used as an approach for river restoration in the United States. The increase in dam removals--particularly large dams--and associated dam-removal studies over the last few decades motivated a working group at the USGS John Wesley Powell Center for Analysis and Synthesis to review and synthesize available studies of dam removals and their findings. Based on dam removals thus far, some general conclusions have emerged: (1) physical responses are typically fast, with the rate of sediment erosion largely dependent on sediment characteristics and dam-removal strategy; (2) ecological responses to dam removal differ among the affected upstream, downstream, and reservoir reaches; (3) dam removal... Categories: Publication; Types: Citation Mueller - 2014 - AGU - Geomorphic Response Geomorphic response in the limitrophe region of the Colorado River to the 2014 delta pulse flow, United States and Mexico On March 23, 2014, a portion of the Colorado River bypassed Morelos Dam, the last dam on the river, and flowed into the dry river channel of the Colorado River delta. This “pulse flow” was the result of an international agreement, Minute 319, which allowed Colorado River water to be stored and released for environmental restoration. The U.S. Geological Survey participated in monitoring effects of the pulse flow, with particular emphasis on the limitrophe reach of the river, which represents the international border for 30 km between Yuma, Arizona, USA and San Luis Rio Colorado, Sonora, MX. Our... Categories: Publication; Types: Citation; Tags: Reach 1, Reach 2, USGS Large-scale dam removal on the Elwha River, Washington, USA: River channel and floodplain geomorphic change A substantial increase in fluvial sediment supply relative to transport capacity causes complex, large-magnitude changes in river and floodplain morphology downstream. Although sedimentary and geomorphic responses to sediment pulses are a fundamental part of landscape evolution, few opportunities exist to quantify those processes over field scales.We investigated the downstream effects of sediment released during the largest dam removal in history, on the Elwha River, Washington, USA, by measuring changes in riverbed elevation and topography, bed sediment grain size, and channel planform as two dams were removed in stages over two years. As 10.5 million t (7.1 million m3) of sediment was released from two former... Categories: Publication; Types: Citation Synthesis of Common Management Concerns Associated with Dam Removal Managers make decisions regarding if and how to remove dams in spite of uncertainty surrounding physical and ecological responses, and stakeholders often raise concerns about certain negative effects, regardless of whether these concerns are warranted at a particular site. We used a dam-removal science database supplemented with other information sources to explore seven frequently raised concerns, herein Common Management Concerns (CMCs). We investigate the occurrence of these concerns and the contributing biophysical controls. The CMCs addressed are the following: degree and rate of reservoir sediment erosion, excessive channel incision upstream of reservoirs, downstream sediment aggradation, elevated downstream... Categories: Publication; Types: Citation