Register to join us in exploring the Condit Dam Removal site and In-Lieu Restoration Site during the 2020 Symposium field trip Friday February 7th from 8am to 1pm.
First Stop: Condit Dam Removal Re-Visited
Almost 100 years old, 125-foot high Condit Dam was breached in October 2011 in response to economic impacts related to fish passage and relicensing. Condit’s breaching went off with a bang: After 800 pounds of dynamite packed into a 13×18-foot tunnel at the base of the dam was detonated, Northwestern Lake, extending 1.8 miles above the dam, drained in just over an hour. As a result, 33 miles of spawning and rearing grounds were opened for steelhead, and 15 miles were opened for salmon. Condit Dam was the second-tallest dam removal project in the United States, with only the removal of Glines Canyon Dam on the Elwha River (210 feet) surpassing it. The tour will visit the Condit Dam site to see how the river and former reservoir area has evolved since dam removal. The status and condition of river habitat, sediment, and fish recolonization will be discussed.
Presenters: PacificCorp and USGS
Second Stop: Underwood In-Lieu Restoration
The Underwood In-Lieu site is a tribal fishing access site at the mouth of the White Salmon River. The in-lieu site provides boat access for Tribal treaty fishers engaged in fishing on the Columbia River. During the Condit Dam breach, the White Salmon River rapidly downcut through the estimated 2.3 million cubic yards of sediment behind the dam. Much of this material deposited within the lower river or was transported out into the Columbia. Sediment deposition at the mouth of the river rendered the In-Lieu site unusable for fishing access. As part of the Condit Dam removal Settlement Agreement, funds were set aside for the Yakama Nation to re-establish access to the boat ramp and dock at the fishing access site. Additional funds were secured to perform habitat and vegetation enhancement work as part of this effort. In January and February 2018, sediment was dredged to open an access pathway for boats to once again utilize the ramp and dock. Dredged sediments were placed on the bar and revegetated, leaving high flow channels for off-channel complexity for salmonid rearing. The point of the bar at the access channel entrance was armored to withstand flow and wave energy. The access channel banks were configured to support salmonid rearing.
Presenters: Yakama Nation