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I ~ I I I I I I I P I I I I I I ~ I United States Department of the Interior BUREAU OF LAND MANAGEMENT Colorado Slale Office 2850 Youngfield Slree\ Lakewood, Colorado 80215-7076 IN REPU' REFER 10: 00-932 7250 MAYr17 1996 Mr. Dan Herriman Colorado Water Conservation Board 1313 Sherman Street, Room 721 Denver, Colorado 80203 Dear Mr. Herriman: The Bureau of Land Hanagement (BLM) is writing this letter to formally communicate its instream flow recommendations for Fourmile Creek. Fourmile Creek is tributary to the Arkansas River near Canon City. Sections of the creek which flow through public lands support a natural environment for self-sustaining populations of brown trout, brook trout, white suckers, and dace. Our data analysis, coordinated with the Division of Wildlife, indicates that the following flows are required to protect the fishery and natural environment to a reasonable degree: Reach Number 1 - Barnard Creek to Biah Creek 6.0 cfs is needed to meet all three instream flow criteria and is therefore recommended for the high temperature period from April 1 through October 31. This flow recommendation is driven by the 50 percent wetted perimeter criteria. 2.5 cfs is needed to meet two instream flow criteria and is therefore recommended to protect the over-wintering fish population from November 1 through March 31. Reach Number 2 - Hich Creek to Cri~Dle Creek 7.0 cfs is needed to meet all three instream flow criteria and is therefore recommended for the high temperature period from April 1 through October 31. This flow recommendation is driven by the 50 percent wetted perimeter criteria. 2.5 cfs is needed to meet two instream flow criteria and is therefore recommended to protect the over-wintering fish population from November 1 through March 31. Reach Number 3 - Wilson Creek A to Wilson Creek B 13.0 cfs is needed to meet all three instream flow criteria and is therefore recommended for the high temperature period from April 1 to October 31. This flow recommendation is driven by the 1.0 foot/second average velocity criteria.