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Last modified
7/14/2009 5:02:35 PM
Creation date
5/22/2009 5:28:18 PM
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Template:
UCREFRP
UCREFRP Catalog Number
9473
Author
Anderson, R. and G. Stewart.
Title
Riverine Fish Flows Investigations.
USFW Year
2001.
USFW - Doc Type
Fort Collins.
Copyright Material
NO
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<br />8 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />An addition study site was added in 2000 and is known as the Clifton Site. This <br /> <br /> <br />station is just upstream and a short section of river separates it from the Com Lake station. <br /> <br /> <br />The new site is from RM 177.7 to 180.4. In this section the river has split flow in two <br /> <br /> <br />sections of the channel and there is an old diversion structure located at RM 179.7. This <br /> <br />structure forms a large backwater upstream along the north shoreline, but small backwaters <br /> <br />are not common in this site. <br /> <br /> <br />The peak flow for the Palisade gage in 1999 was 12,700 cfs on June 10 and in 2000 <br /> <br /> <br />the peak flow was 13,500 cfs on May 31. The median peak flow for the 10-year Palisade <br /> <br /> <br />gage history is 13,950 cfs indicating that peaks for these two years were near normal. In 1999 <br /> <br /> <br />flows during the ascending limb (April and May) of the hydrograph dropped to 435 cfs on <br /> <br /> <br />April IS 1999 and was the minimum flow for the year. Typically flows in March are near <br /> <br /> <br />2,000 cfs, but in some years flows can prop after April 1 due to diversions into the <br /> <br /> <br />Government Highline and Grand Valley canals. The minimum spring flow in 2000 was 1,110 <br /> <br /> <br />cfs on April 5th, and this was also lower than the March flows. In the year 2000, flows <br /> <br /> <br />quickly dropped and flows in June were lower than in 1999 (Figure 5). <br /> <br /> <br />Summer flows were also below normal in 2000 on the Colorado River in the IS-Mile <br /> <br /> <br />Reach. As was the case for the Yampa River, the flows in 2000 provided an opportunity to <br /> <br /> <br />sample the fish population under lower than normal flow conditions. The summer minimum <br /> <br /> <br />flow in 2000 was 530 cfs compared to 1180 cfs in 1999 (Figure 6). The median minimum <br /> <br /> <br />flow during summer for the period of record (10 years) is 686 cfs. Osmundson (1995) <br /> <br /> <br />recommended a minimum flow of 810 cfs for the Colorado River in the IS-Mile Reach. <br /> <br /> <br />Flows were below 810 cfs 0 days in 1999 and 35 days in 2000. <br />
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