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The construction of the Landsburg Diversion Dam on the Cedar River in 1901 created a barrier to salmon and other migratory species in the basin. An additional barrier was created just downstream of the dam by the City’s large water supply aqueduct. These facilities were built to provide a reliable supply of high quality water to the City of Seattle and surrounding area. At the time, little attention was given to the effects of these facilities on aquatic resources. In 2003, as part of the Habitat Conservation Plan and the Landsburg Mitigation Agreement, these barriers were removed and migratory fish were again allowed access to habitat above the aqueduct and dam.
Reestablishing fish passage into over 17 miles of high quality mainstem and tributary habitat in Seattle’s Municipal Watershed upstream of Landsburg Dam is a key component of salmon recovery efforts in the Lake Washington Basin. The four Landsburg fish passage facilities at the dam and aqueduct crossing were completed in 2003:
The number of fish passing above the dam has generally increased since construction of the passage facilities in 2003. Monitoring suggests that fish are performing well in this new habitat and recolonization is occurring. For more information see the salmon recolonization page.
Michele Koehler, Aquatic Resources Manager
Seattle Public Utilities
Phone: (206) 733-9447