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Montana water data · Zip Code in Lewis and Clark County

ZIP 59635: well depth, groundwater and water rights

What the public record says about water in ZIP code 59635: 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 3,688 public records from MBMG GWIC, Montana DNRC, Montana DEQ, EPA SEMS, EPA UST Finder, US Census (ZIP Code Tabulation Area)

Wells on record

1,929

24.3 per sq mi

Median well depth

127 ft

half of wells 91–182 ft

Median static water level

61 ft

1,769 measurements

Median tested yield

30 gpm

1,698 pump tests

Well depth

How deep are wells in ZIP 59635?

Of 1,841 wells with a recorded total depth, the median is 127 feet. Half were drilled between 91 and 182 feet; one in ten went deeper than 277 feet and one in ten found water shallower than 60 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
7%
50–100 ft
25%
100–200 ft
48%
200–300 ft
13%
300–500 ft
7%
500 ft and deeper
1%

Static water level

61 ft

median depth to water at rest · half between 40 and 96 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

30 gpm

median tested yield · half between 20 and 35 gpm

1% of tested wells produced under 5 gallons per minute and 82% 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 59635

540 wells have been completed here since 2016, 8 of them in the last twelve months. The newest log on file was completed May 6, 2026. Records run back to 1870.

What the wells are for

  • Domestic1,544
  • Monitoring180
  • Stockwater64
  • Irrigation54
  • Public Water Supply52

How they were drilled

  • Rotary1,198
  • Cable254
  • Air Rotary128
  • Forward Rotary34

Drillers filing well logs in ZIP 59635

  • A-10 Drilling244 since 2016 · 2026
  • H & L Drilling Inc179 since 2016 · 2026
  • Western Water Wells95 since 2016 · 2025
  • Lindsay Drilling Co Inc8 since 2016 · 2025
  • Okeefe Drilling Co7 since 2016 · 2023
  • Aaaa Water Well Drilling Inc7 since 2016 · 2023
  • Treasure State Drilling104 all-time · 2010
  • A.f. Welch Driling64 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 59635

Montana DNRC lists 1,729 water rights with a point of diversion inside this area: 1,443 groundwater and 286 surface water, 1,592 of them active. The median priority date is 1999, and the oldest claim dates to 1852.

Types of right

  • Ground Water Certificate1,290
  • Statement Of Claim370
  • Exempt Notice41
  • Provisional Permit22
  • Water Reservation3

Purposes

  • Domestic593
  • Domestic; Lawn And Garden399
  • Irrigation181
  • Stock157
  • Lawn And Garden; Domestic48

DNRC basins

  • 41I1,729

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 59635 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.

  • Sediments (tertiary)210 wells · 52% · median 120 ft
  • Alluvium (quaternary)120 wells · 30% · median 64 ft
  • Alluvium (holocene)60 wells · 15% · median 85 ft
  • Spokane Shale6 wells · 1% · median 163 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 59635

Petroleum releases

12

2 open · 10 resolved

Superfund program sites

2

1 on or proposed for the NPL

Registered tank facilities

16

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 2025. A property report screens the sites within a quarter, half and one mile of a specific parcel and links the agency records.