Drive along Highway 28 on the north edge of Plains and you'll pass the town's water tank without giving it a second look. It's just a tank. But that tank, installed 61 years ago and now needing an estimated $300,000 to $400,000 in maintenance just to keep functioning, is doing more to shape what gets built in this town over the next decade than any zoning document sitting in a file at Town Hall.
That's the part buyers miss. If you're pricing land near Plains and pull up the town's Growth Policy expecting a rulebook that tells you what can and can't be subdivided, you're reading the wrong document. The thing that actually decides whether a new lot gets a hookup is the capacity of that water system, and right now the town is in the middle of rebuilding it.
What a Growth Policy Actually Does
Montana's Growth Policy statute is explicit about this: a growth policy is a non-regulatory document. It cannot, on its own, be used to approve or deny a proposed subdivision or development. The Town of Plains updated its Comprehensive Plan this spring, with the Planning Board completing a draft and opening it for resident comment ahead of a hearing at Town Hall in late April. That process matters for the long-range vision of the town, things like where growth should be encouraged and what services the community wants to prioritize. It does not, by itself, determine whether the parcel you're looking at can get a building permit or a water tap.
What determines that is capacity. And capacity in Plains is currently tied up in a single infrastructure project that most out-of-area buyers never hear about.
The Real Constraint Sits Behind the Ranger Station
On September 17, the Sanders County Ledger reported that the Plains Town Council voted unanimously to hire Morrison-Maierle, a Missoula-based engineering firm, to design a new 800,000-gallon water tank. The site is a half-acre parcel on the north side of town, behind the Plains Ranger Station, and the town is finalizing an agreement with the U.S. Forest Service to acquire it. Councilman John Sheridan made the motion to hire the firm; Councilwoman Bonnie Manrique seconded it.
The new tank would replace the existing 500,000-gallon tank on Highway 28. Here's what that comparison actually looks like:
| Current Tank (Highway 28) | Proposed Tank (Behind Ranger Station) | |
|---|---|---|
| Capacity | 500,000 gallons | 800,000 gallons |
| Age | 61 years | New construction |
| Condition | Needs $300,000-$400,000 in maintenance | Not yet built |
| Site status | In use | Land deal with U.S. Forest Service pending |
An 800,000-gallon tank is a 60 percent jump in storage over what the town runs on today. That's not a cosmetic upgrade. It's the difference between a system that's aging out and one that has room to serve new connections, whether those are in-fill lots inside town limits or parcels on the edge that might eventually be annexed.
Why the Timing Is the Whole Story
Mayor Chris Allen told the Valley Press back in February that the tower project would likely run near $5 million, and that the town would need grant funding to cover most of it, but would still need reserves of its own to get the project moving. That's a meaningful number next to the town's entire operating budget. The Council approved a final budget of $3,780,246 for 2026-2027 at the same September meeting where it hired Morrison-Maierle, which puts the tower's price tag at more than the town collects and spends in a full year.
The reason the Council moved quickly on the engineering contract, rather than waiting, comes down to financing risk. According to the Ledger's reporting, the town needed to start the design work now to avoid losing a $1 million loan forgiveness package and other grant funding tied to the project. Grant and loan-forgiveness programs typically come with milestones. Miss one, and the money can evaporate. That's the pressure driving the September vote, and it's also the reason a buyer evaluating land near Plains right now is looking at a system in transition rather than a finished upgrade.
Rates factor into this too, especially as the town weighs a major capital project.
As the Valley Press reported, Allen said of the years since the pandemic began, "We never adjusted anything."
A system that hasn't raised rates in several years while facing a multi-million dollar capital project is a system where a rate increase is a matter of when, not if. That's relevant if you're comparing the carrying cost of owning a lot inside town limits now against what it might cost in two or three years once the new tank is financed and built.
What This Means If You're Pricing Land Near Town
None of this means development in Plains is stalled. It means the sequence matters. A subdivided lot inside town limits with an existing hookup is a different proposition right now than a raw parcel that would need a new water connection, because new connections depend on a system that is, by the town's own account, mid-upgrade with financing still in progress.
If you're comparing Plains to other small towns along the Clark Fork corridor, this is the kind of detail that doesn't show up in a listing description or a portal search filter. It shows up in a September council meeting, reported by the local paper.
Before you write an offer on a lot that would need a new hookup, a few questions are worth asking directly at Town Hall rather than assuming the answer:
- Does this specific parcel already have an active water and sewer connection, or would one need to be added
- Is the town currently issuing new hookups given the pending tank replacement, or is there a waiting period tied to the project timeline
- What is the current base water rate, and has the town indicated when or by how much it expects to raise it
- Is the parcel inside official town limits, where the municipal system applies, or in the surrounding county area served by a different water source
Those four questions get you further than reading the Growth Policy cover to cover.
A Couple of Questions Worth Settling Up Front
Does the updated Growth Policy block or approve new subdivisions in Plains? No. Under Montana law, a growth policy is a non-regulatory planning document. It guides the town's long-term thinking on land use, infrastructure, and services, but it cannot by itself be the basis for approving or denying a specific subdivision or building permit.
When will the new water tank be finished? As of the September 2026 council vote, the project is still in the engineering and land-acquisition phase, with Morrison-Maierle just hired to begin design and the Forest Service land transfer still being finalized. No completion date has been reported publicly yet.
If you're looking at land near Plains, whether it's a riverfront acreage parcel, a subdividable tract, or a smaller in-town lot, the water system's timeline is worth understanding before the paperwork stage, not after. Deborah Warren has been working this market since the late 1990s and can walk you through what a specific parcel's hookup status actually looks like before you make an offer. Reach out for a local market consult.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
