A $200 million Bozeman airport expansion, a $156 million prison build at Deer Lodge, five new nursing buildings statewide and the emergency rebuild of the Milk River lifeline headline Montana's public pipeline.
*How to read the total: the sum of the published figures in the list below. Bases differ by project — most are total cost estimates, some are federal grants, program totals, or construction contracts as awarded. Each project's expanded view labels its own basis. We add them up with the labels showing rather than pretend they're all the same kind of number.
Hover a pin for the project snapshot. Pin numbers match the project list below. Locations are approximate (nearest city or corridor midpoint) on a schematic state outline.
Click any project to expand its full record — description, owner, dates, funding, the law behind it, and its source. Filter by who owns it and where it stands, or sort by cost.
17 major public projects are listed. The listed figures sum to $1,139,400,000 (≈$1.14B). Bases differ and are labelled on every record: published totals, committed appropriations and one contractor-reported programme total. This is a majors list, not a census — Montana DOT, the university system and federal agencies each run long tails of projects below this page's $10M published-figure threshold or without a published project total of their own.
How the big programme cases were handled: only priced, ground-broken work is tallied. At Malmstrom AFB, the listed record is the $26M Sentinel gate that broke ground in May 2026 — USACE's nearly $1B of future Malmstrom Sentinel facilities and the $141B national Sentinel programme are context, disclosed on the record, not Montana totals. On US 93, priced segments are listed (Post Creek Hill / Eagle Pass at $65M; the CSKT-led Ninepipe segment at $110M; Whitefish at $18.5M), not the corridor's unfunded aspirational totals. The five MSU Jones nursing buildings are listed individually at their published construction costs ($91.9M combined); their funding source — a $101M private gift to a public university — is disclosed on each record rather than tallied again or used to exclude them. Fort Peck Dam's current published work (a $9.1M butterfly-valve refurbishment contract) falls below the $10M floor and is not listed; Hungry Horse Dam's $150–$200M powerplant overhaul remains an environmental-assessment-era estimate from 2018 with no current published project total, and is not listed.
News- and trade-flagged sources: several rows rest on news or trade-press reporting of official figures, flagged on their records — the Bozeman airport total (Pacific Builder & Engineer, contractor account, with the $140–$180M range disclosed), the Glacier Park airport total (Daily Inter Lake, airport director's figure), the UM residence hall (Montana Kaimin, university planning estimates, counted at the $100M floor), US 93 Post Creek (Government Market News, MDT figures), the Warm Springs hospital increment (KFF/AP reporting of the commission recommendation) and US 93 Whitefish (Whitefish Pilot, MDT district figures). The softest records on the page are the UM residence hall (no dollar figure in the university's own release), the Warm Springs upgrades (a commission-recommended figure still under state A&E review, carried as design) and the forensic facility (appropriated $26.5M that the state's own planning says may be insufficient, currently paused by court order).
Deliberately excluded: private and nonprofit builds are excluded under the owner rule — Bozeman Health, Billings Clinic and Logan Health (all nonprofit health systems), private mining and energy projects, and private colleges among them; health-system land donations to the public MSU nursing buildings are disclosed on those records and do not change their public-university ownership. Tribal governments are in-scope owners under the owner's October 26, 2026 ruling (where the tribe is the documented project owner or federal grant recipient): the Confederated Salish and Kootenai Tribes' US 93 Ninepipe corridor work (mt-017; celebrated with $110M of Bipartisan Infrastructure Law funding) is now listed. Fort Belknap / Blackfeet water-settlement infrastructure remains excluded-and-named — a tribal-government programme with no single published total, and none is estimated — and the Blackfeet Tribe and the Milk River Joint Board of Control appear as partners, not owners, on the two federal Milk River records that are listed. Completed in a prior year, however large: the Montana Heritage Center in Helena ($107M, opened December 3, 2025), the Missoula Montana Airport terminal programme (South Concourse $64.6M, opened 2022; East Concourse Phase 2, $42M, opened May 2025 — with later Phase 3 / infill work carrying no separate published total above threshold), the Billings Logan International Airport terminal revamp (completed 2024), the St. Mary Siphon itself within mt-006 (completed June 2025, inside a programme whose Halls Coulee element is still building), UM's Knowles Hall renovation ($18M, reopened 2023) and MSU's Romney Hall renovation (completed 2021). Five 2026 completions ARE listed under the current ruling — the five MSU Jones College of Nursing buildings, completed for fall 2026.