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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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 39. PROJECT:Greybull Groundwater
SPONSOR:Town of Greybull
LOCATION:Big Horn County
PROGRAM:New Development
Purpose Chapter Session Account Appropriation Due Date
Level II 8 1995 I $75,000 1996
Level II 15 1996 I $400,000 1998

The town system consists of an infiltration gallery, two flowing wells, two tanks with 1.3 million gallons of storage, and a number of manual and automatic control valves. The town was experiencing some difficulty supplying water due to the need to throttle the valves in the Shell Valley to maintain pressure to the rural users. The town is also under administrative order from EPA for violations of the Surface Water Treatment Rule associated with the diversion through the infiltration gallery on Shell Creek.

In 1995, the Level II study identified several needed improvements to the Shell Creek transmission pipeline. These improvements have been incorporated into a Level III rehabilitation project for the town.

The administrative order has placed Greybull in the position of needing to either build a water treatment plant or find a groundwater source that is not under the influence of surface water. A deep Madison Formation well was drilled during 1996, however, the yield was inadequate to replace the infiltration gallery. Analysis and testing of the well has indicated that is a good candidate for stimulation or fracturing. This stimulation effort is scheduled for the Spring of 1997.

No legislative action is required on this project.

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