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Montana water data · Community in Powell County

Garrison: well depth, groundwater and water rights

What the public record says about water in Garrison: how deep wells go, where the water table sits, what wells produce, which water rights are on file, and which documented environmental sites are nearby. Area statistics orient you; a property report analyzes the records around one specific parcel.

Updated September 2026 · Based on 183 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA UST Finder, US Census (place boundary)

Wells on record

80

8.3 per sq mi

Median well depth

64 ft

half of wells 39–160 ft

Median static water level

18 ft

64 measurements

Median tested yield

20 gpm

76 pump tests

Well depth

How deep are wells in Garrison?

Of 74 wells with a recorded total depth, the median is 64 feet. Half were drilled between 39 and 160 feet; one in ten went deeper than 294 feet and one in ten found water shallower than 34 feet. Depth is set by local geology and position on the landscape, both of which change over short distances, so the spread matters as much as the median.

under 50 ft
38%
50–100 ft
24%
100–200 ft
18%
200–300 ft
9%
300–500 ft
8%
500 ft and deeper
3%

Static water level

18 ft

median depth to water at rest · half between 10 and 40 ft

The static level is how far below ground the water stands before pumping, measured by the driller at completion. It affects pump setting and operating cost, and it moves with season and with neighbouring use.

Well yield

20 gpm

median tested yield · half between 12 and 30 gpm

7% of tested wells produced under 5 gallons per minute and 53% produced 20 or more. These are short completion tests, not sustained-capacity tests; a household typically needs 3 to 5 gpm with storage.

Drilling activity

Recent well drilling in Garrison

10 wells have been completed here since 2016, 1 of them in the last twelve months. The newest log on file was completed October 10, 2025. Records run back to 1919.

What the wells are for

  • Domestic62
  • Stockwater9
  • Public Water Supply4
  • Monitoring2
  • Irrigation2

How they were drilled

  • Cable23
  • Rotary21
  • Foward Rotary9
  • Churn5

Drillers filing well logs in Garrison

  • Okeefe Drilling Co4 since 2016 · 2024
  • Lindsay Drilling Co Inc6 all-time · 1990
  • Jeromes Drilling Co5 all-time · 1985
  • Beck Drilling & Pump4 all-time · 2006
  • Brazill Drilling4 all-time · 1992
  • Lindsay Drilling3 all-time · 2012

Ranked by well logs filed with GWIC, public record only. Not an endorsement, a referral or a paid listing; we have no business relationship with these companies. Verify licensing with the Montana Board of Water Well Contractors before hiring.

Water rights

Water rights on file in Garrison

Montana DNRC lists 98 water rights with a point of diversion inside this area: 56 groundwater and 42 surface water, 96 of them active. The median priority date is 1967, and the oldest claim dates to 1867.

Types of right

  • Statement Of Claim57
  • Ground Water Certificate39
  • Exempt Notice2

Purposes

  • Stock30
  • Domestic29
  • Irrigation18
  • Industrial5
  • Domestic; Lawn And Garden; Stock3

DNRC basins

  • 76G98

Area totals describe the neighbourhood, not any one parcel. Montana publishes no authoritative link between a parcel and a water right; whether a right attaches to a specific property is a property-level question that our reports answer with the DNRC abstract linked.

Aquifers and geology

What wells in Garrison draw from

Drillers record the aquifer a well is completed in. The units below account for the wells here that carry an aquifer assignment; the median depth beside each is for wells completed in that unit.

  • Sand And Gravel (holocene)15 wells · 29% · median 36 ft
  • Carter Creek Formation (of Colorado Group)11 wells · 22% · median 70 ft
  • Golden Spike Fm (of Montana Group)8 wells · 16% · median 92 ft
  • Colorado Shale Or Fm. (of Colorado Group)7 wells · 14% · median 140 ft

Aquifer assignments are the driller's, recorded at completion, and many older logs carry none. Absence of an assignment is not evidence about the geology.

Environmental groundwater screening

Documented environmental sites in Garrison

Petroleum releases

1

0 open · 1 resolved

Superfund program sites

0

none on the National Priorities List

Registered tank facilities

4

underground storage tanks, current and historical

A documented release or site in the area is not evidence that any particular well is affected. Whether a release reaches a well depends on groundwater flow direction, geology, well depth and construction, the extent of the plume and the cleanup performed. The most recent release reported here dates to 1999. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.