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Montana water data · Zip Code in Lewis and Clark County

ZIP 59640: well depth, groundwater and water rights

What the public record says about water in ZIP code 59640: 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 261 public records from MBMG GWIC, Montana DNRC, EPA SEMS, EPA UST Finder, US Census (ZIP Code Tabulation Area)

Wells on record

100

5 per sq mi

Median well depth

84 ft

half of wells 50–160 ft

Median static water level

24 ft

88 measurements

Median tested yield

17 gpm

87 pump tests

Well depth

How deep are wells in ZIP 59640?

Of 93 wells with a recorded total depth, the median is 84 feet. Half were drilled between 50 and 160 feet; one in ten went deeper than 296 feet and one in ten found water shallower than 25 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
23%
50–100 ft
30%
100–200 ft
27%
200–300 ft
10%
300–500 ft
9%
500 ft and deeper
2%

Static water level

24 ft

median depth to water at rest · half between 19 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

17 gpm

median tested yield · half between 10 and 25 gpm

10% of tested wells produced under 5 gallons per minute and 48% 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 ZIP 59640

13 wells have been completed here since 2016, 2 of them in the last twelve months. The newest log on file was completed August 11, 2026. Records run back to 1880.

What the wells are for

  • Domestic87
  • Irrigation4
  • Monitoring3
  • Public Water Supply2
  • Stockwater1

How they were drilled

  • Rotary47
  • Air Rotary18
  • Unknown8
  • Cable5

Drillers filing well logs in ZIP 59640

  • H & L Drilling Inc9 since 2016 · 2025
  • Western Water Wells3 since 2016 · 2026
  • A-10 Drilling1 since 2016 · 2018
  • Lindsay Drilling Co Inc20 all-time · 1993
  • Unknown12 all-time · 1961
  • H And L Drilling5 all-time · 2011
  • Treasure State Drilling4 all-time · 1997

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 ZIP 59640

Montana DNRC lists 159 water rights with a point of diversion inside this area: 87 groundwater and 72 surface water, 142 of them active. The median priority date is 1944, and the oldest claim dates to 1870.

Types of right

  • Statement Of Claim81
  • Ground Water Certificate69
  • Exempt Notice4
  • Reserved Claim4
  • Provisional Permit1

Purposes

  • Stock41
  • Domestic37
  • Domestic; Lawn And Garden17
  • Mining15
  • Wildlife10

DNRC basins

  • 41I103
  • 41QJ56

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 ZIP 59640 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.

  • Plutonic Rocks (upper Cretaceous)11 wells · 69% · median 35 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 ZIP 59640

Petroleum releases

0

0 open · 0 resolved

Superfund program sites

1

none on the National Priorities List

Registered tank facilities

1

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. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.