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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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 29. PROJECT:Gillette Area Well Monitoring
LOCATION:Campbell County
PROGRAM:New Development
Purpose Chapter Session Account Appropriation Due Date
Level II 10 1994 I $400,000 1996

The Fort Union aquifer in north-central Wyoming is the sole source of water for over small 75 public water systems and several industrial and commercial operations in the Gillette area. The Fort Union is also a key element in the water supply for the City of Gillette.

Under a memorandum of agreement between WWDC and the Ground Water Division of the Wyoming State Engineer's Office, a long-range monitoring program to evaluate the condition of the Fort Union aquifer was conducted. The goal of this continuing study is to develop a management plan to insure the long-term, responsible use of this important water resource. The parameters of the study area approximately correspond to the Gillette Planning District, although some monitoring will occur outside the district boundary to establish baseline data, provide control points and sample water quality. Ultimately, the monitoring plan will define the long-term yield of the groundwater resource and determine optimal well spacing. An accurate analysis of the effects of present usage on the condition of the Fort Union Aquifer is essential to proper management of the resource. The results of the analysis will provide information which may be used to develop well spacing requirements, completion standards and other factors to foster efficient use of the aquifer. The information will be used by the WWDC in its funding decisions, by the City of Gillette in its planning efforts, and by the State Engineer in permitting decisions.

In 1994, eight Fort Union monitoring wells were completed in the Gillette area under the supervision of the State Engineer's Office. The wells were logged and equipped with long-term monitoring equipment. A schedule for water quality monitoring was established. In 1995, the State Engineer continued the project with the conversion of several existing wells to monitor wells, the collection of baseline data, and preparation of the project report. The State Engineer has submitted a final report on the activities related to well construction, installation of monitoring equipment, and preliminary data collection. The report was submitted in a format that will allow updating as additional information is retrieved from the ongoing monitoring program. A Task Force consisting of representatives from the SEO, WWDC, Campbell County and the City of Gillette will continue to review monitoring activities, evaluate the results and make recommendations to the affected parties.

No legislative action is required on this project

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