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Last modified
1/26/2010 12:47:01 PM
Creation date
10/11/2006 11:22:04 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8200.766
Description
Gunnison River General
State
CO
Basin
Gunnison
Water Division
4
Date
1/1/1991
Author
USGS
Title
Reconnaissance Investigation of Water Quality-Bottom Sediment-and Biota Associated with Irrigation Drainage - Gunnison and Uncompahgre River Basins and Sweitzer Lake - West Central Colorado
Water Supply Pro - Doc Type
Report/Study
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<br />elements (both sites) for Spring Creek were: arsenic, 2 ~g/L; mercury, <br />0.1 ~g/L; selenium, 3 ~g/L; and zinc, 53 ~g/L. The Colorado Division of <br />Wildlife collected two samples for selenium analysis in 1974 from Loutsenhizer <br />Arroyo; both samples had less than 10 ~g/L of selenium. <br /> <br />Sweitzer Lake <br /> <br />Water-quality data for Sweitzer Lake were collected only for short-term <br />studies. Sweitzer Lake was sampled by the U.S. Geological Survey in August <br />1973 as part of a lake survey in Colorado (Britton and Wentz, 1980). <br />Dissolved-selenium concentrations were 14 ~g/L near the surface and 6 ~g/L in <br />a sample collected near the lake bottom. Other trace-element concentrations <br />were small. The Colorado Division of Wildlife reported selenium concen- <br />trations that ranged from less than 10 to 80 ~g/L in six samples (Colorado <br />Division of Wildlife, written commun., 1987) collected in 1974 from the lake. <br />The U.S. Bureau of Reclamation collected selenium data in 1978 from Sweitzer <br />Lake and from three inflow drains, including the diversion ditch off the <br />Garnet Canal. Five sets of samples were collected from July to October 1978 <br />for dissolved- and total-selenium analyses. The largest concentrations of <br />selenium were in samples collected during August, and less selenium was <br />reported in samples collected in September and October. Selenium concen- <br />trations ranged from less than 5 to 45 ~g/L in the lake and from less than <br />5 to 25 ~g/L in the drains. <br /> <br />Ground Water <br /> <br />Ground-water quality pertaining to salinity in the Uncompahgre River <br />valley is briefly discussed in Meeks (1950). The salinity study of the <br />Uncompahgre Project by the U.S. Bureau of Reclamation describes ground-water <br />quality in relation to salt loading from project lands. Water-quality data <br />for aquifers in the lower Gunnison River basin are reported by Brooks and <br />Ackerman (1985); some of those data are applicable to the study area. A <br />computer retrieval of ground-water-quality data collected by the U.S. <br />Geological Survey had 14 sites in the Uncompahgre River valley north of <br />Colona that had chemical analyses for alluvial aquifers and aquifers in the <br />Dakota Sandstone. Selected water-quality data for alluvial and Dakota <br />Sandstone aquifers are summarized in table 3. The water-quality data in <br />table 3 were collected from 1974 to 1982. The maximum selenium concentration <br />reported in table 3 was for a water sample from a well located about 2 mi <br />north of Sweitzer Lake. <br /> <br />Water-quality data collected by the U.S. Geological Survey for samples <br />representing water in the Mancos Shale in west-central Colorado are summarized <br />in table 4. The data summarized in table 4 are for samples collected at 12 <br />sites from 1974 to 1980. The sample that had 100 ~g/L of selenium (table 4) <br />was not collected in the study area; the sample came from a spring located <br />about 45 mi southwest of Montrose on the west side of the Uncompahgre Plateau <br />(fig. 1). <br /> <br />24 <br />
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