Record Details
page C-72
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page C-72 Final environmental statement : authorized Upalco Unit, Central Utah Project, Utah, page C-72 |
| Coverage | Electronic reproduction; |
| Format | C-72 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; although tolerances of the endangered fishes for temperature turbidity salinity and flow changes have not been deter mined the bureau of reclamation does not believe the species or habitat would be significantly affected by the small changes which have been predicted for these environmental factors for the following reasons the upalco and uintah units and dolores project projects with on stream storage reservoirs would change temperatures in flows immediately below the reservoirs by the time these flows reached the green and colorado rivers which are known to be inhabited by endangered fish species however they would have equilibrated with the average air and soil temperatures thus water temperatures of endangered fish habitat would not be influenced it is anticipated that turbidity levels in 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 deposi decosi tion in the reserv meserv reservoirs oirs airs the changes would be indiscernible by the time flows from the project areas reached known endangered fish habitat because of natural interchanges 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 co 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 co 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 mgt after construction of the five projects at the colorado utah border in 1974 salinity levels in the colorado river ranged from 339 mgl mg1 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 stage to lengths of 10 to 12 inches at willow beach national fish hatchery in water with salinity levels greater than 800 mgl egl mg1i L 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 jul jui july y 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 1 I willow beach national fish hatchery quality of supply water for raceway at willow beach hatchery 1976 C 72 |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/3903 |
