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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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119.PROJECT:Ten Sleep/Hyattville Water Supply Master Plans
LEVEL:New Application
SPONSOR:Town of Ten Sleep - Hyattville Water Company
LOCATION:Washakie County and Big Horn County
PROGRAM:New Development

Ten Sleep: The Town of Ten Sleep has two (2) Madison Formation aquifer supply wells that serve its water supply needs. The oldest well was drilled in 1955 and the second well was added in 1978.The total yield from these source wells (1350 gpm flowing at surface) has been more than ample to serve the community. Consumption however, far outstrips demand, with average use estimated at 2500 gallons per day per person. This use rate figure is approximately ten times the general design considerations suggested for Wyoming public water supply systems by the Wyoming Department of Environmental Quality Water Quality Division Rules and Regulations (WDEQ-WQD Chapter XII, Section 8). This inefficiency is a central consideration to be addressed by the requested study. At task in the study would be an entire review of the system from an evaluation of source supply performance (Ten Sleep #1 Well and Ten Sleep #2 Well) to an appraisal of the transmission and distribution system.

A significant desire for a Level I study is provided by potential rural users who could be served by the town's supply. Expansion of supply outside of town has occurred to some extent but recent residential development in the county near Ten Sleep has encountered insufficient water supply in their domestic wells from a quantity and quality standpoint. Installing deep wells is not an option for these residents who are at close proximity (within 2 to 3 miles) to the town.

Therefore, a small-scale regional plan utilizing the existing Ten Sleep ground water supply is an attainable concept worth consideration in a master plan study.

Hyattville: In 1968, the residents of Hyattville privately formed the Hyattville Water Company for the purpose of developing a safe, reliable supply of water for their community. Subsequently, a deep well was drilled into the Madison Formation that flowed 100 gpm at the time of completion. Using the average daily per capita use for Wyoming (Wyoming Dept. of Environmental Quality Water Quality Division Rules & Regulations, Chapter XII, Section 8) of 125 gallons per day per person, the well could be expected to provide water for 1152 people. In reality, however, Hyattville's water system has consistently failed to deliver an adequate supply of water to the population (approx. 52) ever since it was brought online.

Throughout the summer months, mid-June through mid August in particular, when residents irrigate lawns and gardens, the town's 25,000 gallon storage tank frequently empties completely and the water pressure in the system can drop to nil. When this occurs, members of the community are forced to curtail water usage by means of restricting watering hours. At least one tap is sometimes without water at all. The problems with the system are not altogether clear, it could be diminished flow or pressure at the Hyattville No. 1 Well, or leaks in the distribution system, inadequate storage, or a combination thereof. The Hyattville Water Board sincerely believes a study conducted by the WWDC would reveal those problems with the system and provide solutions to be pursued. The members of the Hyattville Water Board understand that to proceed past Level I involvement with the WWDC (and other public lending entities), the community must organize as a district and is committed to exploring the possibility of forming a public entity soon.

The WWDC recommends the project be incorporated in the New Development program at Level I with an appropriation of $75,000.

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