In response to the Council's recommendation on the Columbia River Fish Accord project, Basinwide Supplementation Evaluation – Phase I (#2009-009-00), CRITFC provided information to justify their proposed use of Dual-Frequency Identification Sonar (DIDSON) to estimate natural escapement of spring Chinook salmon above Castile Falls, Klickitat River. The ISRP found that the CRITFC response clarified issues surrounding the initial use of the DIDSON technology in the Klickitat and met scientific review criteria (qualified).