Resources and Materials

Resolutions

• Okanogan Public Utility District (OPUD) Board Resolution #1775

  Resolution supporting a process to evaluate potential Enloe Dam removal.

• Confederated Tribes of the Colville Reservation (CTCR) Resolution

  Resolution outlining CTCR's support for the removal of the Enloe Dam, remediation of contaminated sediment behind the dam, and the restoration of the Similkameen River to its historical and natural condition.

• Lower Similkameen Indian Band (LSIB) Council Resolution

  Resolution outlining LSIB’s opposition to dam re-electrification and support for the removal of Enloe Dam, remediation of contaminated sediment behind the dam and the restoration of the Similkameen River to its historical and natural condition.

• Upper Similkameen Indian Band (USIB) Council Resolution

  Resolution outlining USIB’s support for the removal of Enloe Dam, remediation of contaminated sediment behind the dam and the restoration of the Similkameen River to its historic natural condition.

Background Studies and Technical Material

• United States Geological Survey Sedimentation Study

  • 2019 USGS survey of the Enloe Dam reservoir that revealed elevated trace element concentrations, notably arsenic, associated with historical mining activities and ore-processing waste within the sediment behind the dam.

• United States Geological Survey Sediment Volume Work

  • USGS study regarding the concentrations of contaminant trace elements and sediment volume estimates behind the Enloe Dam.

• Washington Department of Ecology Sedimentation Study

  • 2023 ECY study on sediment samples from the Enloe Dam reservoir and downstream areas that revealed elevated levels of arsenic and sulfide, particularly along certain transects, indicating localized contamination in the reservoir sediment.

• Water and Power Law Group Memorandum

  • Report describing a feasible pathway to pursue removal of Enloe Dam in cooperation with Okanogan Public Utility District (PUD), the dam owner. The report analyzed potential liabilities arising from dam removal, along with strategies to avoid and manage such liabilities.

• 2023 Enloe Proviso Report

  • Report that outlines a series of assessments to analyze the steps and options for potentially removing Enloe Dam on the Similkameen River in Washington. The assessments include developing a dam removal road map, recommending a collaborative engagement framework, assessing potential Dam Removal Entities, and reviewing sediment removal options.