|Title:||Cle Elum Lake: productivity and fertilization potential|
|Author/Editor:||Douglas B. Dey|
|Institution:||Report of the Fisheries Enhancement Program, Northwest Fisheries Science Center, National Marine Fisheries Service|
The National Marine Fisheries Service is involved in a project to develop a selfsustaining, naturally spawning, harvestable run of anadromous sockeye salmon Oncorhynchus nerka in the Cle Elum Lake watershed. Cle Elum Lake is the largest but least productive of the major irrigation reservoirs in the Yakima River basin. There is evidence that production levels were much higher in Cle Elum Lake prior to damming of the lake and the elimination of its anadromous sockeye salmon runs. To re-establish the Cle Elum Lake sockeye salmon runs, one of the basic requirements is that productivity levels in the lake be sufficient to support the pre-migratory juvenile population. This report discusses the recent productivity status of Cle Elum Lake, reviews the results of relevant lake fertilization studies, and assesses the suitability of Cle Elum Lake for artificial fertilization.