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Last modified
7/14/2009 5:02:31 PM
Creation date
5/18/2009 12:26:50 AM
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UCREFRP
UCREFRP Catalog Number
7769
Author
McAda, C. W., J. W. Bates, J. S. Cranney, T. E. Chart, W. R. Elmblad and T. P. Nesler.
Title
Interagency Standardized Monitoring Program
USFW Year
1994.
USFW - Doc Type
Summary of Results, 1986-1992 - Final Report.
Copyright Material
NO
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Reach 4-The upper Green River reach extends from Split Mountain Campground at the lower <br />end of Dinosaur National Monument downstream 120 miles to Sand Wash, just upstream from <br />Desolation Canyon. The uppermost 10 miles are characterized by steeper gradient (mean, 4.2 ft/mi) <br />and cobble-rubble substrate. Below that point, the river enters the broad Uintah Basin floodplain and <br />is relatively slow and meandering (mean, 1.1 ft/mi) with primarily sand-silt substrate. The lowermost <br />10 miles are confined within aloes-desert canyon, also with low gradient and fine substrates. <br />Methods <br />River Flows and Water Temperatures <br />Mean-daily river flow measured at USGS gaging stations nearest to each sampling reach (Figure <br />1; Reach 1, Colorado River at Cisco, Utah; Reach 2, Colorado River at Utah-Colorado State line; <br />Reach 3, Green River at Green River, Utah; and Reach 4, Green River at Jensen, Utah) was averaged <br />for the sampling period in each reach. Various river flow parameters over the course of the year <br />were also summarized. Mean flow for the months of April through September was calculated for <br />each of the 7 years of ISMP. Mean-daily river flow for the day of highest flow during the year was <br />determined. In addition, mean flow during the period including 15 days before and 15 days after the <br />day of highest mean-daily river flow for the year was calculated (average high flow). Water <br />temperature for each reach was summarized by summing the degrees (C) by which mean-daily water <br />temperature exceeded 12, 16, and 20°C over the course of the year (accumulated temperature units). <br />Flow records were complete for all USGS gages summarized here; however, temperature records <br />were inconsistent. Gages on the Green River at Green River, Utah and Colorado River at the Utah- <br />Colorado state line used continuously recording thermographs so a true mean could be calculated. <br />However, gages on the Green River at Jensen, Utah and Colorado River at Cisco, Utah reported once <br />daily measurements (i.e. someone measured water temperature by hand once a day). Although not a <br />daily mean, these values were used in temperature calculations because they were the only data <br />available for these stations. There were also significant gaps in temperature data during some years at <br />some gages. Short gaps (i.e. 15 days or less) were filled using interpolation between temperatures <br />recorded on either end of the missing data. However, gaps longer than 15 days or gaps that occurred <br />during periods when temperatures were rapidly changing were not filled because interpolation was not <br />considered appropriate in those cases. Water temperature data were not summarized when gaps could <br />not be filled. As a result, temperature data were not summarized for Reach 2 in 1986 and 1987 and <br />for Reach 4 in 1987. <br />Colorado squawfish Sampling <br />Each reach sampled was divided into 5-mile subreaches which formed the basis for the sampling <br />design (Figure 2). A sampling crew began at the top of each reach and traveled downstream until it <br />reached a suitable backwater (surface area of at least 30 m2 and maximum depth of at least 30 cm, <br />unless the water was turbid) which it sampled with a 4.6-m-long, 3-mm-mesh seine. Two non- <br />overlapping seine hauls were taken in the backwater. Effort was recorded as area swept by the seine. <br />Colorado squawfish were measured, counted, and released alive if they were large enough to be <br />reliably identified. Fish of other species that were also large enough to reliably identify were counted <br />and released. All remaining fish in the first sample were preserved for later identification in the <br />laboratory to check for Colorado squawfish too small to be identified in the field. Non-target fishes <br />were later counted in the laboratory for this sample only. Investigators then proceeded downstream <br />4 <br />
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