Bathymetry and Sediment Classification of the Klamath Hydropower Project Impoundments

Bathymetric surveys were conducted on Lake Ewauna, Keno Reservoir, JC Boyle Reservoir, Copco Reservoir, and Irongate Reservoir. A supervised sediment classification was also conducted on each of these impoundments. A general assessment of the magnitude of accumulated sediment in the impoundments was conducted by comparing the current bathymetry of the impoundments with available information on pre-impoundment topography. The results indicate the sediment accumulation in the impoundments is relatively modest, generally ranging from 5 to 15 percent of the current volumes.