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<br />Minimum Flow: <br /> <br />Optimum Flows: <br /> <br />75 efs (5/1 - 9/30) <br />55 cfs (10/1 - 4/30) <br />Basis: CDOW recommendations to CWCB on ISF needs as <br />documented in 12/8/87 letter) <br /> <br />PHABSIM data from Denver Water indicates that the minimum <br />flow necessary for physical habitat is 50 cfs. This study was used <br />to establish the CWCB instream flow. Stream channel habitat <br />improvements are currently being designed as part of a cooperative <br />project between local interests, USFS, DW and others~ This <br />project will likely change low flow aquatic life requirements. <br /> <br />100 cfs year round <br />Basis: Barry Nehring's CDOW F-51 (7/88) report recommends a <br />55 efs minimum and 100 cfs optimum flow for all life stages of <br />brown trout. <br /> <br />Specific Exceptions: 1. Releases in the range from 55 to 125 efs should not increase <br />more than 15% over a 24-hour period (e.g~ over 6 days instead of 2 <br />days). <br />2. Above 125 efs, changes in releases should track with the rate of <br />change in the inflow hydrograph for the reservoir. <br /> <br />Other Sources: *** Dale K. Fields, Summit Guides, author of "Plow Rates and <br />Stream Entomology of the Blue Ri ver", also, Kevin Macreery, Mountain Anglers <br /> <br />Stream Reach: <br /> <br />---------~~~~~~--~-~-~~~---------------------~~~-----~--~--~~~-~-~-~~~-------------~~~~-~-~-~~-------------- <br /> <br />Blue River Below Green Mountain Reservoir <br /> <br />Problem Identified: 1 ~ Reservoir releases that decrease after spawning result in <br />freezing of redds and stranding of adults and emerging fry. <br />2. Inadequate flows do not provide necessary physical habitat for <br />fish. <br /> <br />Minimum Flow: <br /> <br />60 efs (5/1 -7/15)* <br />140 efs (7/16 -- 9130)* <br />100 cfs (10/1 - 4/30)* <br />Basis: CDOW 12/8/87 letter on ISF reconunendations for CWCB, <br />also concern by TU regarding lowest flows during spring runoff <br /> <br />Specific Exceptions: 1. Above 140 efs, changes in releases should track with the rate of <br />change in the inflow hydrograph for the reservoir. <br /> <br />Stream Reach: <br /> <br />~~-~-~-----~~~~-~-------------~~~--~-~~~~~~-----------~----------------~~~--~~~----------------~~~~-~~------ <br /> <br />Colorado Ri ver below Windy Gapt above Williams Fork <br />