Record Details
page C-81
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page C-81 Final environmental statement : authorized municipal and industrial system, Bonneville Unit, Central Utah Project, Utah, Vol. 1, page C-81 |
| Coverage | Electronic reproduction; |
| Date | 14 |
| Format | C-81 text/PDF |
| Rights | Brigham Young University; http://lib.byu.edu/about/copyright/generic.php Public Domain Public |
| Language | English; eng; en |
| Relation | Central Utah Project; Western Waters Digital Library; the upalco and uintah units and dolores project projects with on stream storage reservoirs would change temmperatures in flows immediately below the reservoirs by the time these flows reached the green and colorado rivers which are known to be inhabitated by endangered fish species however they would have equilibrated with the average air and soil temperatures thus water temperatures of endan bendan gered cered fish habitat would not be influenced it is anticipated that turbidity levels on the lake fork uinta whiterocks and dolores rivers immediately downstream of the upalco and uintah units and dolores project would be slightly decreased during spring runoff as a result of sediment deposition in the reservoirs the changes would be indiscernible by the time flows from the project areas reached known endangered fish habitat because of natural inter changes of sediment pickup and deposition in the duchesne and dolores rivers project return flows from agricultural lands would enter the duchesne and san juan rivers where they would slightly increase turbidity levels during the summer the paradox valley and grand valley units are not expected to affect stream turbidity the salinity changes in the colorado river basin that would result from the five projects in the colorado river basin are not expected to affect any of the endangered species for all have been recorded as living in areas with extensive variations in salinity levels salinity levels as far downstream as lees ferry are projected to average about 641 mg1 mgl mgt after construction of the five projects at the colorado utah border in 1974 salinity levels in the colorado river ranged from 339 mg1 mgl mgt to 1300 mg1 mgl mgt with no apparent adverse effects on the endangered species in that area the colorado squawfish has also been successfully reared from egg to lengths of 10 to 12 inches at willow beach national fish hatchery in water with salinity levels greater than 800 mgli mg11 agli the upalco and uintah units and dolores project would reduce historic peak flows and slightly increase historic low flows in known habitat areas of endangered fish species during average years flows during the july august augus t september spawning and rearing season would be increased while late fall winter and spring flows would be reduced because post project flows would be within the range of historic flow fluctuations in these areas however it is not thought that the flow changes would have adverse effects changes in stream flows resulting from the paradox valley and grand valley units would not be significant exact numerical values for the flow changes caused by the five projects are not given because the probability of error in measurement is substant substan bially tially greater than the changes themselves would be an unknown amount of endangered species habitat may be restored in the green river below flaming gorge dam as a result of the penstock modifications which were completed in 1978 the modifications allow water to be released from the dam that will reach optimum temperature ranges for endemic fish species downstream I 1 1 willow beach national fish hatchery quality of supply water for raceway at willow beach hatchery 1976 C 81 |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/7108 |
