Elwha Hot Springs Road Restoration
#16104 #16104
 WRIA18 West: Elwha River Watershed Mainstem Elwha River Elwha Hot Springs Road Restoration
Organization North Olympic Peninsula Lead Entity for Salmon
Sponsor Lower Elwha Klallam Tribe
Status Planned
Schedule
Category Category: Restoration
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DESCRIPTION
Removal of two hydroelectric dams on the Elwha River was initiated in 2011 as authorized by the Elwha River Ecosystem and Fisheries Act (PL102-495). Elwha Dam was completely removed in the spring of 2012 and Glines Canyon Dam was removed during the fall of 2014. The management of sediment accumulated within the two reservoirs has been a major challenge or the overall project. An estimated 21 million cubic yards (+4 million) had accumulated in the two reservoirs during their operational life. The preferred alternative for managing this accumulated sediment was river transport, in which the Elwha River's natural hydrology was used to transport the sediment downstream. This has proven to be highly effective and an estimated 60% of the total stored sediment has evacuated the reservoirs. This material has dispersed widely and has been accumulating in the estuary, nearshore and in floodplain habitats along the river since dam removal began in 2012. In 2014-2015, significant floods have occurred on the Elwha and the river is responding dynamically. In general, the river has widened, and reconnected with its historic floodplain. New floodplain channels are forming and these will provide important habitat for salmonids. Unfortunately, there is floodplain infrastructure in some locations on the Elwha that was built while the dams were in place. These areas are now being impacted by the river. The Hot Springs Road which provides the only access to the Elwha Valley in Olympic National Park (ONP) is one such location. Since dam removal the Hot Springs Road in the vicinity of the Elwha Campground, has been flooded mulitiple times. The road is washed out by an activated side channel to the Elwha River and the campground has been buried in sediment (Figure 1). The Hot Springs Road is currently permanently closed to public access at the ONP entrance. This proposal represents a long term solution to conflicts between the Elwha River and Hot Springs Road and would include two elements: 1) an engineering design element to relocated portions of the Hot Springs Road currently impacted by flooding within ONP, and 2) a construction phase to actually relocate the road to those preferred locations.
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