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LIST OF FIGURES Figure Page 1. Frequency of use of simple and complex channel types by adult Colorado squawfish .................... 8 2. Relative catch-per-effort for three introduced minnow species in the 18-mile reach of the Colorado River near Grand Junction, Colorado, 1986-1989 ....................... 14 3. Plot of geometric-mean catch-per-effort (C/E) versus maximum-annual discharge for post-larval Colorado squawfish collected during October, Colorado River, 1982-1988 ...................................................... 15 4. Peak flows (mean flow on the highest flow day of the year) and catch rates of Colorado squawfish larvae and young-of-the-year (YOY) in the 18-mile reach (Gunnison confluence to Loma) of the upper Colorado River, 1986-1989 ............................................... 19 5. Correlations of peak flow and catch rates of larval and young-of-the-year Colorado squawfish in the 18-mile reach (Gunnison confluence to Loma) of the upper Colorado River, 1986-1989 ................................ 20 6. Recent and historic spring flows in the upper Colorado River at the top of the 15-mile reach (15) and near the Colorado/Utah State line (STLN), and in the Gunnison River (GU) near Grand Junction (including Redlands power canal) ................................................... 29 7. Recent and historic frequencies of peak flows (highest flow day of the year) of various magnitudes .................... 30 8. Time series of peak flows in the upper Colorado River at the top of the 15-mile reach and at the Colorado/Utah State line, 1897-1989 .......................................... 31 9. Recent and historic mean monthly flows in the Colorado River at the top of the 15-mile reach and in the Gunnison River near Grand Junction, Colorado ................... 32 10. Mean monthly discharge at USGS gaging stations on three upper Colorado River basin rivers .............................. 36 11. Change in mean peak flow (highest flow day of the year) for three upper Colorado River basin rivers .................... 37 12. Razorback sucker captures from the Colorado River between Loma and Palisade, Colorado (RM 152.8-185.1), 1974-1990 ...................................................... 38 vii