Laserfiche WebLink
<br />. <br /> <br />Because 1he Pine River supports populations of blue head sucker, flannelmouth sucker and Colorado River <br />cutthroat trout, i1 should be noted, 1hat the CDOW and several other slate and federal agencies are involved <br />in developing Conservation and Management Plans for these species. The intention of these plans is 10 <br />increase populations and distributions of these species, 1hereby assisting in the long-1erm persistence of each <br />species. The success of such plans could potentially curtail the need for federal listing ofthese species under <br />1he Endangered Species Act (ESA). These species are not currently federally lis1ed. <br /> <br />Pine River Instream Flow Data Summary <br />The stream cross section data was analyzed using the R2CROSS program. The R2CROSS output was <br />evalua1ed using the methods described in Nehring (1979) and Espegren (1996) to determine 1he flows <br />required 10 preserve the natural environment to a reasonable degree. The Tennant Method (a,k.a. Montana <br />Method) in conjunction with 1he stream cross section data collected was used to determine flows thaI would <br />improve the natural environment. The Tennant Method is based on percen1ages of average annual flow <br />derived from recorded hydrologic records. <br /> <br />The CDOW selected two different and unique sites for stream cross section data collection, The first site <br />was located on property owned by the Cool Water Ranch (CWR Site) and is approximately 2.5 miles <br />downstream of1he confluence of Jack Creek and Y. mile downstream from the Division Engineer's stream <br />gage on the Pine River. This site is located in the narrow confined portion of the Pine River Valley. The <br />second site was located on property owned by a private land owner near a pedestrian foot-bridge (FB Site) <br />and is located approximately 7.5 miles downstream of the CWR Site and 10 miles downstream of the <br />confluence of Jack Creek. This site is located in 1he wider unconfined portion of1he Pine River Valley. <br /> <br />Cool Water Ranch Site <br />The CWR Sitl: is located within the narrower confines ofthe upper Pine River Valley and in the upper 1/3 of <br />the proposed stream reach. The CDOW collected stream cross section data at seven different locations <br />within this site. The average width of these seven cross sections was approximately 70 feet. The summer <br />flow recommendations, which meet 3 of 3 criteria and were within the accuracy range of the R2CROSS <br />model, range from 112 cfs to 72 cfs. The winter flow recommendations, which meet 2 oD criteria and were <br />within the accuracy range of the R2CROSS model, range from 75 cfs 10 30 cfs (see Table 1 below). <br /> <br />Table 1: Cool Water Ranch Site: <br /> <br />Date XS# 0 ORan"" 3/3 2/3 <br />417104 I 60.7 154-24.6 !O3 40 <br />4/7/04 2 59.2 148-23.7 72 30 <br />417104 3 57.2 143-23.0 112 --- <br />417104 4 63.0 160-26.0 100 --- <br />417104 5 75.4 188-30.0 83 45 <br />417104 6 66.6 173-28.0 72 61 <br />417104 7 65.6 163-26,0 92 75 <br />A veraee 90 50 <br /> <br />Averaging the seven summer flow recommendations wi1hin range, results in a 90 cfs recommendation. <br />Averaging the five winter flow recommendations within range, results in a 50 cfs recommendation. <br /> <br />. Foot-Bridl!.e Site <br />The FB Site is located in 1he middle of the Pine River Valley and in 1he lower II3 of the proposed stream <br />reach. The CDOW collected stream cross section data at four different locations wi1hin this site. The <br />average width of these four cross sections was approximately 110 feet. The summer flow recommendations, <br />which meet 3 of3 criteria and are wi1hin the accuracy range of the R2CROSS model, range from 260 cfs to <br />