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Wyoming Water Development Commission 
Harry C. LaBonde, Jr., PE, Director 
6920 Yellowtail Rd, Cheyenne, WY 82002 
Phone: 307-777-7626 

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 27. PROJECT:Cheyenne Supply Pipeline
SPONSOR:City of Cheyenne
LOCATION:Laramie County
PROGRAM:New Development
Purpose Chapter Session Account Appropriation Due Date
Level I 74 1993 I $250,000   1994
Level II 8 1995 II $250,000   1996
Level III 96 2000 I $11,000,000* 2004
*60% grant; 40% loan (7.25%, 30 years)

In 1992, the CBPU requested funding for several projects. The WWDC suggested the CBPU complete a master plan to prioritize future improvements. The city's existing master plan had become dated and did not address the latest EPA requirements.

In 1993, the Wyoming legislature approved funding to update the Cheyenne Water Supply Master Plan. In 1994 the master plan was completed. The plan identified needed improvements, suggested priorities, estimated costs, and now serves as a planning tool for the city. Approximately $62,000,000 in needed capital improvements has been identified. The identified improvements include an extensive upgrade to the CBPU Sherard Water Treatment Plant and several transmission system improvements. These improvements were prioritized and recommended for completion by the year 2007. Additional Level II analysis was recommended to refine designs and cost estimates.

In 1996, States West Water Resources Corporation completed a Level II study of the Cheyenne Water Supply System. Conceptual designs and cost estimates were prepared for 1) a raw water system to irrigate parks and golf courses, 2) improvements to the raw water lines feeding the water treatment plant, 3) a new water transmission main to the east side of Cheyenne, 4) corrosion analysis, and 5) improvements to the Supervisory Control and Data Acquisition System.

WWDC funding was authorized during the 2000 Legislature in the amount of $11,000,000 (60% grant, 40% loan) to construct a portion of a second raw water supply line from Crystal Reservoir to the new Sherard water treatment plant. The new 36-inch line total length is approximately 15 miles. The City of Cheyenne proposed to build approximately 12.1 miles of the lower part of the 36-inch line as the first phase of the project, based upon a project cost estimate of $11,000,000 and the knowledge that existing lines and the line extension to that point would be able to provide 36 MGD flows to the new Sherard water treatment plant. The remaining upper 3 miles of the 36inch line would then be built as a future Phase II as flow demands in Cheyenne increase beyond 36 MGD. With Phase II of the 36-inch line completed, total flow capacity of existing and new lines is estimated to be 58 MGD.

Excellent competitive bids on the first phase of the project allowed the City of Cheyenne to extend the first phase of the project and additional 1.6 miles beyond the original 12.1 miles, increasing the raw water delivery capacity to the Sherard water treatment plant to 48 MGD. The remaining 1.3 miles from the Hecla diversion to Crystal Dam and Reservoir is currently under design and will be completed using the remaining $1.9 million balance available the $11,000,000 authorization.

The City of Cheyenne has been advised by their engineer not to utilize the full increased capacity of the pipeline (48 MGD) until the outlet works at Crystal Dam and Reservoir are modified to safely handle the increased flow. The City of Cheyenne is therefore requesting that the 2000 legislation authorizing this project be changed to allow modification of the outlet works pipes, valves and flow control building at Crystal Dam and Reservoir, along with increasing the project appropriation by $2 million.

The WWDC recommends that the project be continued at Level III in the New Development Program with an additional appropriation of $2,000,000 to include the construction of Crystal Dam and Reservoir outlet modifications. WWDC further recommends the funding reversion date for the project be amended to be July 1, 2007. The financing plan includes an additional 60% grant of $1,200,000 and an additional 40% loan of $800,000 at 7.25% interest for 30 years. The total project appropriation is increased from $11,000,000 to $13,000,000.

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