Record Details
page C-46
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page C-46 Final environmental statement : authorized Upalco Unit, Central Utah Project, Utah, page C-46 |
| Coverage | Electronic reproduction; |
| Format | C-46 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; 3 both species inhabit the green river above and below the rivers confluence with the duchesne river 4 because there would be about a 60 gomile mile distance between project features and the green river and a 17 mile distance between these features and the confluence of the duchesne river it is very improbable that the project would cause any temperature change or turbidity level increase in either stream 5 salinity measured as total dissolved solids TDS would increase in the lower duchesne river as a result of the project however the magnitude of the increase would be well within the tolerance range of the fish species as indicated by identified locations of existing populations the TDS level in the green river at the confluence of the duchesne river the nearest area considered to be principal habitat is not expected to vary during an average water year but is expected to range from about a 0.5 05 05 percent increase in a wet year to about a 0.8 08 08 percent decrease in a dry year expressed in mgl mg1 mgt this average change in TDS is estimated as follows average water year 1958 457 mg1 mgl mgt wet water year 1952 413 mgl mg1 mgt to 415 mg1 mgl mgt dry water year 1934 543 mgl mg1 mgt to 539 mg1 mgl mgt both the colorado squawfish and humpback chub have been taken on the colorado river near grand junction colo where maximum concentrations of up to 1290 mg1 mgi mgt have been recorded and concentrations of over 600 mg1 mgl mgt were recorded in 7 months of a single year bureau of reclamation 1977d geological survey 1973 at the willow beach national fish hatchery in arizona where the TDS of the hatchery water is over 800 mgl mg1 mgt colorado squawfish have been held and successfully reproduced in the raceways rac eways and the young have been raised to a 9 to 10 inch size fish and wildlife service 1976d thus it would appear that the TDS or the major constituents sodium potassium and chloride are not the limiting factor in the continued existence of these endangered species in the upper colorado river drainage 6 the change in flow of the green river below the duchesne rivers confluence would be so small as to be within the margin of error for geological survey gauges thus the changes caused by the upalco unit are actually immeasure immeasured able and must be calculated using indirect methods flows in the green river during the spawning period would remain virtually unchanged with project implementation summer flows would be slightly enhanced and winter flows would C 46 |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/6560 |
