Laserfiche WebLink
<br />sandstone separated by steep slopes or benches of shale. siltstone. or <br />~_ thin-bedded sandstone. The oottom can be reached near Blue Springs only by a <br />00 rugged foot trail from the rim or by helicopter. The springs originate from <br />~ ground water which moves into the area from the east and south and emerges as <br />_I springflow where the canyon has penetrated the Redwall and Mauve limestones <br />below the regional water table. There are many spring openings along two <br />relatively well-defined reaches. <br /> <br />A full scale feasibility study of the project is not planned due to <br />the high capital cost of building the project and environmental problems <br />resulting from the significant historical and religious value of the area to <br />the Hopi Indians. <br /> <br />3. Colorado River Indian Reservation Unit (Reclamation and USDA) <br /> <br />The Colorado River Indian Reservation has a total of 268,850 acres <br />located in the lower Colorado River Basin below Parker Dam in northern Yuma <br />County. Arizona. and the eastern part of the San Bernardino and Riverside <br />Counties, California. <br /> <br />The United States Supreme Court allocated water to irrigate 107,588 <br />acres, of which 99,374 acres are in Arizona and 8,213 acres are in California. <br />The allocation of the court also provided for a maximum diversion of 717,148 <br />acre-feet. In 1978, 75,405 acres were irrigated with Colorado River water <br />diverted at Headgate Rock Dam. About 200 miles of canals and laterals <br />delivered water to irrigate this acreage. Irrigation return flows are <br />collected in a 100-mile drainage system and are returned to the river. <br /> <br />The purpose of the Colorado River Indian Reservation unit <br />investigation was to formulate a plan to reduce the salt loading to the <br />Colorado River from irrigation on the reservation. An analysis of the <br />diversions to and drainage from the reservation indicated that the reservation <br />did not make a net salt contribution to the river. Consequently, the <br />investigation was terminated, and a concluding Report was released in October <br />1979 to present the studies performed. <br /> <br />A Cooperative River Basin Study has been completed by USDA <br />on the Colorado River Indian Reservation. Data available from this study <br />support the hypothesis that a minimal amount of salt is picked up on the <br />reservation and that long-term benefits of better irrigation systems and <br />practices appear to have a relatively small effect on downstream salinity. <br />The final USDA report on the study, Water Conservation and Resource <br />Development, Colorado River Indian Reservation, which did not identify a <br />recommended plan, was recently published and distributed under authority of <br />Section 6 of the watershed Protection and flood Prevention Act (Public <br />Law 83-5661. <br /> <br />4. Dirty Devil River Unit (Reclamation) <br /> <br />The Dirty Devil River unit is located in Emery and wayne Counties in <br />southern Utah. The study area includes the Muddy Creek, the fremont and Dirty <br />Devil Rivers, and the tributaries of Muddy Creek, Hanksville Salt Wash, and <br />Emery South Salt wash. The Dirty Devil River drainage contributes <br />approximately 150,000 tons each year to the Colorado River. The Muddy Creek <br />tributary contributes the most salt, an average of 86,000 tons of salt <br />annually. No significant sources of salt or potential alternatives were <br /> <br />VII-14 <br />