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Other Green River activities will involve restoration of bottomlands adjacent to the Green River which flood in the spring and provide important habitat for razorback suckers and Colorado squawfish. A pilot restoration effort is being initiated at the Escalante Ranch wetland near.Jensen, Utah and Old Charlie Wash near Ouray, Utah. A management plan for these wetland areas will be completed by April 1994; implementation of the plan is scheduled for 1994-1996. The management plan will address water control devices to allow for endangered fish access, control of nonnative fishes, stocking of the wetlands with razorback suckers, possible environmental contaminant problems, and other land use or management activities. Refuge (captive) populations of razorback suckers collected from the Green River will be developed and maintained at the Endangered Fish Hatchery at Ouray, Utah. A plan for augmenting razorback suckers into the Green River using hatchery propagated fish will be developed in 1994 and implemented in 1995-1998. Contamination of water in Stewart Lake and Ashley Creek near Jensen, Utah with the heavy metal, selenium, has been identified as a source of impact to the razorback sucker. The Fish and Wildlife Service, the Environmental Protection Agency and the Bureau of Reclamation are actively pursuing clean-up activities in these areas independent of the Recovery Program. 3.2 YAMPA RIVER AND LITTLE SNAKE RIVER 3.2.1 Importance The Yampa River, a tributary to the Green River, is essential for the maintenance and recovery of the endangered fishes in the Green River basin. The relatively unaltered flows of the Yampa River are responsible for providing a natural shape to the hydrograph of the Green River. Catch rates of adult and sub-adult Colorado squawfish which occupy the river year-round are high when compared with other areas of occupied habitat in the basin. The Yampa River contains one of two confirmed Colorado squawfish spawning areas in the Upper Basin and is a major producer of fish for the entire Green River basin (Tyus and Karp 19891. The Colorado squawfish Recovery Plan (USFWS 1991) has identified the Yampa River as one of the essential habitat areas that must be protected before the Colorado squawfish can be considered eligible for delisting. A small but apparently self- sustaining population of humpback chub exists in the Yampa River in Dinosaur National Monument (Tyus and Karp 19891. The Humpback Chub Recovery Plan (USFWS 1990a) identified the Yampa River in Dinosaur as one of the primary recovery areas for the humpback chub. Adult and larval razorback suckers have been captured in the mouth of the Yampa River. Adult razorback suckers have been captured upstream to the mouth of the Little Snake River (Tyus and Karp 19891. The lower portion of the Yampa River was part of the historic range of the bonytail chub and is associated with some of the most recent captures of this very rare fish. The Bonytail Chub Recovery Plan (USFWS 1990b) identifies the Yampa 14