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GREEN RIVER STUDY PLAN 20 February 2,2007 Table 1. Continued. Anticipated Effects and Uncertainties (Hypotheses) Summary Priority AlO. Gradually declining flows after the spring peak will provide reproductive cues to Y L Colorado oikeminnow and humpback chub adults (Muth et al. 2000). A 11. Limiting differences in water temperature between the Green and Yampa rivers at their confluence in Echo Park will prevent cold shock to Colorado pikeminnow larvae drifting out Y L of the Yampa River and into the Green River (Muth et al. 2000). A12. Warmer temperatures will promote better growth of endangered fishes in the upper Y L portion of Reach 2 (Muth et al. 2000). U17. The effect of peak flows, sediment availability, and antecedent conditions on the P H relationship between base flow level and backwater habitat availability (Muth et al. 2000). U18. The effect of base flow variability (within-day, within-season, within-year, between years) on backwater habitat quality (e.g., temperature, productivity) (U.S. Department of the P H Interior and Western Area Power Administration 2005). U19. The relationship between base flow magnitude and temperature at the confluence (higher base flow targets in wetter years could result in higher temperature differential at the P M Yampa-Green River confluence) (U .S. Department of the Interior and Western Area Power Administration 2005). U20. The need for real-time temperature data at the confluence to achieve temperature P L targets (U.S. Department of the Interior and Western Area Power Administration 2005). U21. The effect of base flows on nonnative fish populations (Muth et al. 2000). Y H Reach 3-SDrine Peak A13. The anticipated effects of peak flows in Reach 3 for each hydrologic condition are qualitatively similar to those in Reach 2. However, since less floodplain and backwater habitat exists in Reach 3, quantitative differences in the effect of peak flows are expected. P L Benefits of overbankflooding to razorback suckers are expected to be most important in the upper portions of the reach (between the White River and upper end of Desolation Canyon) where most floodplain inundation will occur (Muth et al. 2000). A14. Flooded off-channel habitats will benefit young Colorado pikeminnow and razorback suckers in lower Reach 3 and humpback chub in Desolation and Gray Canyons (Muth et al. P L 2000). A15. Gradually declining flows after the spring peak flow will provide reproductive cues to P L Colorado pikeminnow and humpback chub adults (Muth et al. 2000). U22. The response of nonnative fish populations to spring peak flows (U.S. Fish and P L Wildlife Service 2005). Reach 3-Summer Throueh Winter Base A16. Wet and Moderatelv Wet: Lower water temperatures at higher base flows in the wettest years may reduce growth and survival of young endangered fish. Average. Dry. and Moderatelv Dry: Higher water temperatures at lower base flows will P L enhance growth and survival of young endangered fish, particularly Colorado pikeminnow and humpback chubs (Muth et al. 2000). U23. The effect of peak flows, sediment availability, and antecedent conditions on the P M relationship between base flow level and backwater habitat availability (Muth et al. 2000). U24. The effect of base flow variability (within-season, within-year, between years) on backwater habitat quality (e.g., temperature, productivity) (U.S. Department of the Interior P H and Western Area Power Administration 2005). U25. The effect of base flows on nonnative fish populations (U.S. Fish and Wildlife Service P M 2005).