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~p.91~~ e~~~e~~e the preceeding discussion I have'sho~*e- that the Green River Basin contains the most abundant stocks of Colorado squawfish known. The Yampa River is the last mayor river of the Upper Colorado River Basin that has no mainstream dam, and hence its flows do not differ si nificantly from historic. It is no surprize that the er-Colorado River C g Committee (USFW 1987) ~as targeted ~a~' the Yampa River for immediate water rights acquisition,~aad-'~Tie IISFWS is Cos, R~`~' ~~~~~ proceeding to determine instream requirements of the rare and endangered fishes here, and to quantify these instream flows (Tyus and Rarp 1988). a , n~eragency studies by the Bureau of Reclamation, Bureau of Land Management, National Park Service, USFWS, and the states of Colorado and Utah, have added considerably to ou~7r~~knQwl dge of the needs of the fish in the Green VMGrL 1 'l Y'f~~J18W7 River basin since 1979 (reviewed by USFWS 198$•. Many of these studies have been concerned with d~~crv~~ in Cream flows for the endangered fishes, and as~~ ~~ ~-results of these studies, BR and FWS are cooperating to provide and evaluate ~~ ation and maintenance the en River. These ma @,~t~.~ }.cam studies ~e~fnthe life requi d~ ~~~ ~ empirical verification of certain flows from Flaming Gorge Reservoir that are deemed necessary for ~ S ~ ~ -~ of nursery habitat for larval Colorado squawfish in ~ 6~ s Green River - ` - -«~-- ~s a~ I ~` rements and habitat use of the endangered fishes, and 4 alI recommended flow scenarios. NQ2v' Green River- BR and FWS are finishing a large study of the requirements of rare and endangered Colorado River Fishes with respect to the operation of Flaming Gorge Dam. The results of these studies ^r°~;^ ""' '"'~ will be provided in 1989 as part of a Biological Opinion, and supporting documents, under Section 7 of the ESA (Tyus et al 1989). In 1984, FWS recommended interim flows needed to maintain nursery habitat for young (Age 0) Colorado squawfish, 22