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2003 LEGISLATIVE REPORT
Active Projects
11. | PROJECT: | Big Horn Regional Water Supply | | | | | |
| LEVEL: | II/III |
| SPONSOR: | Big Horn Regional Joint Powers Board |
| LOCATION: | Big Horn, Washakie, Hot Springs
Counties |
| PROGRAM: | New Development |
| |
| EXISTING LEGISLATION: |
|
Purpose |
Chapter |
Session |
Account |
Appropriation |
Due Date |
|
|
Level II |
36 |
2000 |
I |
$160,000 |
2002 |
|
|
Level II |
86 |
2001 |
I |
$670,000 |
2002 |
|
|
Level III |
88 |
2001 |
I |
$5,500,000 |
2007 |
|
|
Level II |
7 |
2002 |
I |
$675,000 |
2002 |
|
PROJECT INFORMATION:
In 2000, BRS Inc. completed a Level II investigation of ground water potential for a municipal
water supply in the southern Big Horn Basin. Eight (8) well sites were investigated within the
southern Big Horn Basin that could potentially yield abundant (>500gpm), good quality (<500
mg/l TDS) water. These sites were chosen on the basis of geologic structure, drilling depths,
geothermal gradient, distance from known geothermal activity, accessibility, and potential ground
water quality. An extensive review of ground water data within the southern Big Horn Basin
reveals that the most likely aquifer to yield abundant, good quality water is from the Paleozoic-age
Madison-Big Horn Aquifer system. A secondary target aquifer, that is deemed viable in the
study, is the Cambrian-age Flathead Sandstone.
Of the sites considered, a location at the Wild Horse Anticline (13 miles east of Thermopolis) and
a location at the Buffalo Creek monocline (6.5 miles SE of Thermopolis) both ranked as top
choices. A test well was drilled in September/October of 2001 at the Wild Horse Anticline site as
a Madison-Big Horn Aquifer completion. Production yields from this well were low (~ 60 gpm)
and therefore did not meet the requirements of the sponsor. The original intent of ground water
exploration in Hot Springs County was to establish a southern basin well field capable of
providing yield to match or exceed maximum daily use requirements of potential Hot Springs
County users (including the town of Thermopolis) and provide a supplemental supply to other
users to the north if and when needed. One well would not feasibly nor reliably meet this
requirement. Therefore, it is the wish of the Big Horn Rural Joint Powers Board to pursue the
second test well. A suitable test drilling site will be chosen in early 2003.
The continued Level II study will also include determining the feasibility of expanding the joint
powers service area in Big Horn County. Potential rural users who have shown interest in
regional supply are Greybull River users SW of Greybull, Basin Gardens, and users west of Basin
to the area centered at Otto. The Town of Burlington may also benefit from regional supply and
rural users beyond Burlington at Emblem may fall in a feasible service area.
The 2000 WWDC Level II Study by BRS Inc. also completed an investigation of routing a
second transmission pipeline from the Worland well field down the Nowood River valley then
south to Worland. Along this route the pipeline would connect with South Big Horn Rural JPB
system (SBHRJPB, supplied by Manderson wells) and with Washakie Rural Service &
Improvement District (supplied by Worland). Worland's existing 24" pipeline from its well field
has failed twice recently, demonstrating the vulnerability of their potable water supply. The
Level II also explored conceptual plans for looping and connecting the northern portion of the
regional system between SBHRJPB and the Town of Greybull. It was revealed that chlorination
facilities in northern Hot Springs County are needed because of low chlorine residuals in that
portion of the regional system.
The Level III funding is for construction of that portion of the alternate regional pipeline from the
City of Worland's existing well field to the users in the Big Horn Basin and a regional pipeline
crossing the Big Horn River was provided by the legislature in 2002. The engineering design is
underway.
RECOMMENDED LEGISLATIVE ACTION:
No legislative action required.
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