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Lottis Creek ISF Proposal with Attachments 10-27-21
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Lottis Creek ISF Proposal with Attachments 10-27-21
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Last modified
1/4/2023 8:05:25 PM
Creation date
1/4/2023 12:18:04 PM
Metadata
Fields
Template:
Instream Flow Appropriations
Case Number
22/4/A-002
Stream Name
Lottis Creek
Watershed
East River
Water Division
4
Water District
59
County
Gunnison
Year
2022
Instream Flow App - Doc Type
Supplemental Data
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Biological Summary <br /> Lottis Creek is a coldwater snowmelt-driven stream with substrate that ranges from small gravels to <br /> large boulders.There is a mixture of riffles and pools that provide quality habitat for fish and other <br /> aquatic life. There are also several beaver complexes that provide healthy wetland habitat in the <br /> riparian area. <br /> Data provided by Colorado Parks and Wildlife shows a healthy recreational fishery that has both rainbow <br /> trout and brown trout. HCCA staff saw several fish when conducting R2Cross assessment work.The <br /> biological data are summarized in Attachment B. <br /> The riparian zone is in good condition along lower Lottis Creek and provides shade and cover for the <br /> extant fish community.There are both active and abandoned beaver ponds at several locations <br /> alongside the creek. It is primarily pine forest near the headwaters.The riparian area along the middle <br /> section of the creek is primarily composed of willow communities. <br /> Preliminary R2Cross Analysis <br /> HCCA relied on the expertise of Alpine Environmental Consultants LLC to interpret output from the <br /> R2Cross model and develop a preliminary instream flow recommendation that will protect Lottis Creek's <br /> natural environment to a reasonable degree. <br /> On July 21, 2020, a R2Cross field survey was completed in Lottis Creek near the confluence with the <br /> Taylor Fork of the Gunnison River.The R2Cross Model output supports a summer flow recommendation <br /> of 5.7 cfs;the winter flow recommendation was out of range (Table 2). <br /> On September 13, 2020, a second survey was completed at the same location in Lottis Creek.The <br /> R2Cross Model output supports a summer flow recommendation of 8.5 cfs.These data were used to <br /> create the preliminary instream flow recommendations for Lottis Creek(Table 2).The R2Cross output <br /> and field forms are attached for review (Attachment C). <br /> The existing ISF rate of 5 cfs is recommended to protect the Lottis Creek natural environment during <br /> winter months (Table 2). A summer flow rate of 7.1 cfs is recommended based on the results of the <br /> 2020 cross-sections (Table 2).The summer flow rate is a 2.1 cfs increase over the existing year-round ISF <br /> rate. <br /> The proposed dates for the winter ISF rate are November 1 to March 31.The proposed dates for the <br /> summer ISF rate are April 1 to October 31.The dates and or summer flow rate may be revised based <br /> upon additional review of physical and legal water availability. <br />
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