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LIST OF FIGURES <br />1. Eleven study strata on Colorado River and one study stratum on Gunnison River <br />identified for sampling in this project. Divisions in strata were based upon <br />differences in geology, geomorphology and gradient ....................... 4 <br />2. The 1994 and 1995 hydrographs for the Colorado and Gunnison rivers. Solid bars <br />denote sampling periods ........................................... 9 <br />3. The cumulative distribution (percent less than) of substrate sizes of bed materials in <br />the Colorado and Gunnison rivers. Data are for river-wide averages ........ 10 <br />4. The mean and 95% confidence interval of the D 16 and D50 values calculated for the <br />river-wide substrate samples collected in 1994 and 1995 in the Colorado and <br />Gunnison rivers ................................................. 11 <br />5. The mean and 95% confidence interval of the depth-to-embeddedness values <br />calculated for the river-wide substrate samples collected in 1994 and 1995 in the <br />Colorado and Gunnison rivers ....................................... 11 <br />6. The mean and 95% confidence interval of the percent embeddedness values <br />calculated for the river-wide substrate samples collected in 1994 and 1995 in the <br />Colorado and Gunnison rivers ....................................... 12 <br />7. The mean and 95% confidence interval of the void volume values calculated for the <br />river-wide substrate samples collected in 1994 and 1995 in the Colorado and <br />Gunnison rivers ..................................................12 <br />8. The average light profiles for the Colorado and Gunnison rivers during the spring of <br />1994 and 1995 ...................................................13 <br />9. The linear relationship between the calculated extinction coefficient (k) and water <br />turbidity in the spring of 1995 in the Colorado River ..................... 13 <br />10. The river-wide mean concentrations of nitrogen, phosphorus and total suspended <br />solids for four time periods in the Colorado River ....................... 14 <br />11. Water temperatures and turbidity values in the Colorado River for 1994 and 1995 at <br />the Colorado-Utah stateline (station #09163500) ........................ 14 <br />12. The mean and 95% confidence interval of the periphyton chlorophyll values <br />calculated for the river-wide substrate samples collected in 1994 and 1995 in the <br />Colorado and Gunnison rivers ....................................... 15 <br />iv