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N'1 OONTENTS PagF FIGURE 6. Contributions to mean annual run-off of the Green River at Little Valley ----------------------------------------- 8 7. Typical regimen of the Price and San Rafael Rivers--------- 91 8. Green River Lakes reservoir site-------------------------- 102 9. New Fork Lake reservoir site---------------------------- 103 10. Willow Lake reservoir site-------------------------------- 104 11. Fremont Lake reservoir site------------------------------ 105 12. Half Moon Lake reservoir site---------------------------- 106 13. Burnt Lake reservoir site--------------------------------- 107 14. Boulder Lake reservoir site------------------------------- 103 15. Upper Bear reservoir site-------------------------------- 118 16. Upper Bear dam site------------------------------------ 119 17. Starvation dam site------------------------------------- 140 18. Superior Lake reservoir site------------------------------ 142 19. Five Point Lake reservoir site---------------------------- 143 20. Scanner reservoir site ------------------------------------ -------------- ------------------- - - 146 21. Whiterocks Lake reservoir site---------------------------- 149 22. Paradise Park reservoir site------------------------------ 150 23. Lower Joes Valley reservoir site--------------------------- 157 24. Map of Green River Basin in Wyoming showing principal irrigation projects------------------------------------- 174 25. Red Canyon dam site---------------------------------- 238 26. Swallow Canyon dam site------------------------- ---- 239 27. Echo Park dam site------------------------------------- 242 28. Rock Creek dam site------------------------------------ 244 29. Rattlesnake dam site ------------------------------------ 246 - -- - Y PREFACE By NATHAN C. GROVER ' The Green River and its drainage basin are interesting economically, historically, and scenically. The river constitutes one of the great natural resources of Wyoming, Colorado, and Utah. It has had an influence on the exploration, settlement, and development of the Vest and is woven into the history of the white man's progress throughout a broad region. Its canyons are grand and beautiful but unfortunately are so difficult to traverse that tbev have been seen by relatively few people. The Green River is the largest tributary of the Colorado and brings to that river nearly one-half of the water flowing in the stretch just be- low the junction. The mean annual run-off of the Green from a drain- age area of nearly 45,000 square miles is about 5,700,000 acre-feet; the mean annual run-off from a drainage area of 26,500 square miles of the Colorado above the Green is about 6,800,000 acre-feet. Although its drainage basin is more than 70 per cent greater than that of -the Colorado above the junction, the run-off of the Green is somewhat smaller because of the relatively low precipitation on much of the basin. It is far larger,than any other tributary of the Colorado, the next in size being the San Juan, which has a mean annual run-off of somewhat more than 2,500,000 acre-feet. The drainage basin of the Green, situated in Wyoming, Colorado, and Utah, ranges in altitude from more than 15,000 feet in the summits of the mountains to about 3,900 feet in the valley at its mouth: - The average annual precipitation on the basin ranges from perhaps 50 inches or more near the summits of the high mountains to 6 inches or less in -the southernLvalleys.- The -run-off from -tributaries-ranges from perhaps 30 inches or more in depth in the high mountain areas to a small fraction of an inch in the driest valleys. Within the basin of the Green are mountain valleys that have excefent stands of timber, broad fertile valleys that are irrigated in part, excellent range lands for :stock and vast areas of mountains and valleys that are essenti .v of desert character..:Within i't.,also are large deposits of phosphate rock, extensive coal fields which yield valuable-bitumunovs coals add yi.st.azeas-of oil $hat? Qil ede that may have eonsiderAle fut i? j portance may yet-be d'iseovered ? Chie(hyd.B?s erb?,:n?r, U. S Oeclegfml 9tmeY, ., _.