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-4- A detoxification prcgr.am designed to neutralize the toxic chemical somewhere below Flaming Gorge damsite was initiated by the participating agencies in January of 1962. The detoxification effort would attempt tc insure perpetuation of native fish species within Dinosaur National Monument. Again, the Bureau of Reclamation was asked if any method could be employed to partially close the diversion tunne7_ or otherwise reduce flows passing the dam so that detoxification operations could be simplified. The Bureau felt that even partial clos~,~.r.e might endanger the structure. Therefore, detexifi- caticn had to proceed upon the full flow of the river. The project was financed by the Section 8 program of the Colorado River Storage Project Act at a total cost of 106,000. The Bureau of Sport Fisheries and Wildlife cf the U. S. Fish and Wildlife service supported the program anal acted as the coordinating agency in the administration cf Fede.ral funds designated for the pre,ject. To facilitate the handling of these funds, all expenditures were initially financed from the Wyoming Game and Fish Fund and reimbursed through the Bureau of Sport Fisheries and Wildlife upon completion cf the project. Other. participating agencies included the U.S. Fablic Health Service and the Ccler.ado Game and Fish Department. In order to evaluate the effect of the rotenone treatment en stream faa.na, a D.J. study (F-25-R-2) was initiated on June 1, 1962 and will contir.~e through December, 1963. The objectives of the study include an appraisal cf the aquatic invertebrate population of these waters treated prier to and for at least a one-year per.ied following treatment, and to study the recovery made by fish populations within the limits of the project. By anticipating and critically evaluating a fishery potential of a proportion never before encountered in Utah and Wyoming, and by taking positive action to guide that potential into desirable channels, initial responsibilities have been met. In progress are programs formulated long before the treatment to insure that the sport fishery of the Flaming Gorge Reservoir and the Green River will. have every opportunity to realize its full potential.