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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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 93. PROJECT:Sheridan Area Water Supply
SPONSOR:Sheridan Area Water Supply Joint Powers Board
LOCATION:Sheridan County
PROGRAM:New Development
Purpose Chapter Session Account Appropriation Due Date
Level III 31 1989 I $15,500,000* 1996
Level III 77 1990 I $8,800,000* 1996
Level III 89 1993 I $12,256,000* 1996
Level III 59 1996 I $650,000* 1999
*75% grant, 25% loan (4%, 15 years, 5 year deferral)

The WWDC became involved in the Sheridan project because the city was found by the Environmental Protection Agency (EPA) to be in violation of the Safe Drinking Water Act. The city delivered untreated water to about 102 homes on the system's raw water supply lines between the diversion works on Big Goose Creek and the treatment plant located north of Sheridan. During the analysis of this problem, other water supply problems were identified. Sheridan's Twin Lakes supply reservoirs were in need of rehabilitation, as were other components of the system. Sheridan was also seeking a supplemental source of supply to meet peak day demands and provide for future growth. Over 1,000 homes in Little Goose Valley and over 200 homes in Big Goose are dependent on shallow wells of poor quality and declining quantity. Both the mediation process; involving the city, the EPA, and area representatives; and WWDC studies concluded that the best solution to the raw water delivery violations was a comprehensive area-wide water supply and treatment system.

During the 1989 Legislative Session, the Sheridan Area Water Supply Joint Powers Board (SAWSJPB) requested, the WWDC recommended, and the legislature approved an appropriation of $15,500,000 for the main frame of the project, the enlargement of Twin Lakes Reservoir and the major water transmission facilities. In addition, the SAWSJPB requested and the legislature approved an appropriation of $6,750,000 from the Permanent Mineral Trust Fund to serve as a 100% loan for the construction of a water treatment plant in Big Goose Valley.

In 1989, the Sheridan County voters overwhelmingly approved the capital facilities tax. In addition, the Big Goose/Soldier Creek Water District, the Little Goose Water District, and Big Horn Water District were formed. These districts, along with the previously organized Woodland Hills Improvement District and the Southeast Water and Sewer District, began the process of obtaining commitments from rural water users within their boundaries for the purchase of water. Over 1,075 rural water users committed to the project. The conceptual designs for the rural pipeline systems were developed based upon the actual numbers and location of rural water users committed to the project. During the 1990 Legislative Session, funding was requested and approved for the transmission pipelines necessary to serve the rural areas.

In 1992, the Level II conceptual designs and cost estimates for the last project component, a raw water transmission pipeline from the intake structure on Big Goose Creek to the city's existing water treatment plant, was completed. The pipeline is needed as two existing raw water pipelines must be abandoned due to deterioration, they were losing approximately one million gallons of water per day, and a third raw water pipeline will be converted to a treated water pipeline to deliver water from the new Big Goose Water Treatment Plant. The proposed transmission pipeline will consist of a 30-inch diameter pipe and will be approximately 11.5 miles long. During the 1993 Legislative Session, the funding was requested and approved for this pipeline, the East Side Transmission main needed to adequately serve a portion of the service area, and budget adjustments to the Twin Lakes Enlargement necessary to accommodate design changes and environmental mitigation. The construction of the raw water transmission pipeline was completed in the spring of 1996.

To date, there have been 21 separate construction projects completed as part of the Sheridan Area Water Supply Project. These projects include new pipelines, storage facilities, and a new water treatment plant. A revised Twin Lakes Enlargement with a smaller reservoir and less impact on wetlands is now under construction. The dam has been completed and only clean up work remains. Project closeout will occur in the spring of 1999.

No legislative action is required.

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