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Last modified
8/11/2009 11:32:56 AM
Creation date
8/10/2009 3:41:27 PM
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UCREFRP
UCREFRP Catalog Number
7425
Author
Vandas, S. e. a.
Title
Dolores River Instream Flow Assessment
USFW Year
1990.
USFW - Doc Type
Project Report.
Copyright Material
NO
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<br />Pre-McPhee Dam Hydrology <br /> <br />The Dolores River, in its headwaters, flows in a <br />southwesterly direction to McPhee Reservoir. The <br />river then turns to the northwest and flows into the <br />Colorado River near Cisco, Utah (see Figure 1). <br />Mean annual precipitation varies from approximately <br />8 inches at the mouth to more than 50 inches in the <br />headwaters. Roughly 50 percent to 60 percent of this <br />precipitation falls as snow. The mean annual flow of <br />the river at the mouth was 763 ft3js, which equates to <br />an annual yield of approximately 550,000 acre-feet. <br />This does not include approximately 173,000 acre- <br />feet diverted from the river for both in-basin and out- <br />of-basin water use. For a summary of the basin's <br /> <br />hydrological and physical characteristics, see Table 1. <br />The study reach is located about mid-watershed, <br />as measured by river miles (see Figure 6), beginning <br />at Bradfield Bridge approximately 11 river miles <br />below McPhee Dam and ending roughly 94 river <br />miles downstream from Bradfield Bridge at Bedrock, <br />Colorado. Precipitation in the study area varies from <br />about 12 to 16 inches annually. The drainage area <br />between Bradfield Bridge and Bedrock is about 1,149 <br />square miles or 25 percent of the Dolores River <br />Basin. <br />The mean annual flow of the river at Bedrock <br />was 465 ft3js. Mean monthly flow values for the <br /> <br />Table 1, Dolores River Basin Hydrological and Physical Characteristics <br /> <br />Station Name Below Rico At Dolores Nr, McPhee At Bedrock At Gateway Nr, Cisco <br />CO CO CO CO CO UT <br />Period of Record 1951-81 1895-81 1938-53 1917-81 1936-54 1950-81 <br />Comp Years 30 70 14 15 18 31 <br />Drainage area 105 504 817 2,024 4,350 4,909 <br />(mi2) <br />Station Elev, 8,422 <br />(ft) 6,919 6,666 4,940 4,548 4,165 <br />Mean Basin 9,800 8,200 7,900 <br />Elev, (ft) 10,600 9,200 8,000 <br />Channel Length 20 48 59 148 185 204 <br />(mi) <br />Annual preclp, 26 18 16 11 11 8 <br />(in,) <br />Mean Annual 132 426 403 938 763 <br />Flow (ft3/s) 465 <br />Land Class as a Percent of Basin Area <br />Forest 99 93 90 65 45 40 <br />Agriculture 0 5 6 15 15 15 <br />Range 0 0 3 18 40 45 <br />Water 1 1 1 1 0 0 <br />Urban 0 1 0 1 0 0 <br /> <br />12 <br />
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