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" . . PROJECT SUMMARY ENLARGEMENT OF FISH CREEK RESERVOIR Mount Werner Water and Sanitation District June 15, 1992 PROJECT DESCRIPTION Fish Creek Reservoir presently has a storage capacity of 1,842 acre-feet. The proposed project is anticipated to increase reservoir storage by 2,200 acre- feet for a total of 4,042 acre-feet. To accommodate this increase in storage, the dam will have to be raised by 17.5 feet~ from 55 feet (at it's maximum height) to 72.5 feet. In addition, a saddle dam will need to be raised and a new spillway constructed at a higher elevation. The dam and reservoir are located on the Middlp Fork of Fish Cre~k, approximately seven miles east of the City of Steamboat Springs. The reservoir is on Forest~ervice orooerty and is owned by the City of Steamboat Springs. The City has signed an agreement with the Mount Werner Water and Sanitation District to permit the District to raise the dam and make use of the additional storage. PROJECT NEED The District's average daily usage of water during a recent 12-month period was 2.4 mgd (2,680 acre-feet/year), with peak daily usage at 5.0 mgd. With the District presently using a flat fee rate structure, annual demand is estimated at 2,900 acre-feet. Water demand is expected to initially drop in 1993 when metering goes into effect, but continuing growth is projected to increase demand to 3,200 acre-feet per year by the year 1997 and to 3,800 acre-feet per year by 2000. Firm annual yield of the District's water system is prasently estimated to be 3,000 acre-feet. The enlargement of Fish Creek Reservoir is expected to increase the firm yield of the water system to 5,000 acre-feet per year, an increase of some 2,000 acre-feet per year. The District lies wholly within the City of Steamboat Springs, comprising some 42 percent of the City's area. An agreement between the two entities provides for the District to treat water (up to 2.5 mgd) for the City, and for the City to treat the District's wastewater. TECHNICAL FEASIBILITY The technical aspects of increasing the Fish Creek dam height by 17.5 feet are documented in a recent report prepared by Woodward-Clyde for the District. The report, "Conceptual Design for Enlargement of Fish Creek Reservoir, Steamboat Springs, Colorado," dated October, 1991, addresses only the issues related to raising the dam. Detailed geotechnical investigations were performed by Woodward-Clyde Consultants during the summer of 1991. The reservoir is scheduled to be emptied in September of 1992 to complete this analysis so that final design could be initiated this coming fall and completed in time to bid the project in April of 1993. 1