Bonner Data Center
Missoula County is reviewing a proposed data center at 9314 Bonner Mill Road. The property is zoned industrial, and the current review is focused on the proposed industrial use's potential impacts on nearby residential properties, not whether a data center is an allowed use under the zoning in this location.
The proposal involves reusing a portion of the former mill building — commonly referred to as the planer building — for a high-performance computing (HPC) data center. This means most of the development would occur inside the existing structure, with no major expansion of the building footprint. Interior improvements would include constructing specialized rooms to house computer servers and supporting equipment.
The proposed data center would operate continuously, 24 hours a day, seven days per week, with minimal on-site staffing and relatively limited vehicle traffic associated primarily with maintenance and service visits.
The cooling system consists of a combination of adiabatic and evaporative cooling towers. The evaporative units would use water supplied from the site's existing fire suppression well rather than the domestic well system serving nearby residences. The applicant has indicated that no backup generators are proposed in the event of power outage.
The initial phase of the facility is expected to use approximately 7 megawatts (MW) of electrical power, with the potential to expand over time to utilize up to 29 MW, which is the estimated capacity currently available at the site.
May 11 - Third Application for Special Exception Application (Also found on the right hand side under documents).
- Click here for the special exception application.
- Click here for the supplemental narrative.
- Click here for the supplemental information 4-27-26.
- Click here for the supplemental information 5-5-26.
- Click here for the complete Bonner site plan.
- Click here tor the heat study site plan - Washington example.
Missoula County Consolidated Land Use Board (MCCLUB) public meeting: Wednesday, July 1, at 6 p.m.
- In-person location: 200 W. Broadway, Missoula County Courthouse, Sophie Moiese Room
- Virtual option: Residents can attend the meeting via Microsoft Teams. To join the meeting on your device, follow the links on the agenda that will be published on the Consolidated Land Use Board page.
Project summary
Current step: Special exception review
Application status: Complete application submitted; special exception in review with hearing scheduled for July 1, 2026
Expected hearing: Wednesday, July 1, at 6 p.m.
- The consolidated land use board hearing is currently scheduled for Wednesday, July 1, at 6 p.m. The meeting will take place in person in the Sophie Moiese Room of the Missoula County Courthouse, 200 W. Broadway, and virtually via Microsoft Teams. The agenda and information on how to join the meeting virtually will be available online prior to the meeting.
- The project will be subject to review by the Missoula County Consolidated Land Use Board, not the county commissioners. While the land use board at times only has authority to make recommendations to the commissioners, the board does have final decision-making authority in some cases, including zoning variances, zoning special exceptions and administrative action appeals.
What is being reviewed in this project proposal?
The Special Exception review is focused on whether the proposed industrial use, including its equipment and operations, would be compatible with nearby residential properties and whether potential impacts can be avoided or mitigated.
If a special exception is approved, the developers must apply for a zoning compliance permit. The permit application must demonstrate compliance with the County's data center zoning regulations, including requirements for new renewable energy and e-waste recycling. Zoning compliance permits are subject to administrative review and do not go through public hearing process.
Project review timeline
March 2026: Initial Contact
- Krambu and Missoula County Planning first discussed the proposed data center project.
March 25, 2026: First Special Exception Application
- The applicant submitted the first Special Exception application. County staff determined that more information was needed before public review could begin.
April 28, 2026: Second Special Exception Application
- The applicant submitted additional materials. County staff continued reviewing the application and identified remaining information needed for completeness.
May 11, 2026: Third Application for Special Exception (deemed complete)
- The applicant has submitted a complete application. A hearing is scheduled for July 1, 2026.
Late May/Early June: Public Notice Period
- The County will mail notices to property owners within 500 feet, publish a legal notice, and post notices near the property.
July 1, 2026: Land Use Board Hearing
- The Land Use Board is expected to consider the Special Exception request.
July 2026 or Later: Possible Permit Review
- If approved, Krambu may then apply for a Zoning Compliance Permit and other required permits.
MCCLUB may consider the following when reviewing this special exception:
- Traffic and site access, pedestrian facilities
- Noise and vibration from cooling equipment and other mechanical systems
- Water use, water quality, wastewater discharge, and potential cooling system effects such as vapor, drift, or icing
- Outdoor lighting and glare
- Visual impacts and effectiveness of proposed landscaping and screening
- Utility and infrastructure impacts
- Emergency access, fire protection, and hazardous materials management
- Any other circumstances relevant to compatibility with nearby residential uses
How can I participate?
Community members are encouraged to stay informed and provide public comment. Comments are most helpful when they address the topics the Land Use Board may consider during Special Exception review, especially potential impacts to nearby residential properties.
Follow this project page if you want be emailed when there are updates with this project.
Unacceptable. People dream of coming to Montana for its wilderness and beauty. We, famously, have rejected pointless and crippling things that modernize just for the sake of ease. Missoulians work hard to maintain a way of life that honors the natural world and our independence from a world that rewards assimilation at the cost of integrity.
Our state is famous for not tolerating cowards! A data center is a disgusting bid to ingratiate ourselves area to developers and people who seek to carve us up for profit.
I vehemently oppose the approval of a data center anywhere in MT. I have been a resident of this beautiful state for over 20 years, and I shudder to think of our lands being used to support billionaire agendas and feed off of the backs of hardworking people. This data center would ruin everything that we stand for as conservationists and stewards of the land. Clean water is essential for HUMAN life, not a computer. I urge the council to see that their decision affects Missoula, and goes as far as affecting our entire country. Do not allow this data center to be built.
As a born and raised Missoulian, I can not oppose this data center enough. Missoula is already drought-stressed enough as is, and can not afford to waste our precious water on a data center. Please, for the love of our environment, our community, and our health, oppose this proposal.
As a Missoula Montana resident I strongly oppose the building of the Bonner data center. The energy, water ( even if it’s from the fire well), other unknown environmental hazards, and the precedent of data centers as a productive use of space is not in our communities interest. Please listen to your constituents who overwhelmingly oppose the Bonner data center!!!
Absolutely not!!
As a Missoula county resident, nature lover, and parent I strongly oppose this application, for our generation and all those to follow. There is no benefit to our community and we can create something much more generative and sustainable with this space.
I am vehemently opposed to a data center in Bonner for a lot of reasons. The health of nearby residents, the cost of the power and the excessive use of OUR WATER is outrageous. With no apparent benefit to anyone except Northwestern Energy and the out of staters who are trying to push this through.
There are hardly any added jobs. The threat to our environment is substantial and our constitution guarantees us the right to clean air and WATER.
The vibration that will be created will make people sick. The bitcoin mine was a disaster and this will be worse. Do not allow this to happen!!!
I emphatically urge the members of the MCCLUB to respond to this application with a resounding NO, NO, NO! The multitude of reasons why this is a very bad idea have already been posted via the many prior comments here. At the very least, Missoula County citizens should be allowed to vote on this before its approval is rammed down our throats.
this is a definite NO.
Besides the vast increases in electrical bills and water consumption used by the station, which will of course not only impact local missoula residents but also the wildlife, deteriorating the beauty of the area, the data center will emit large concentrations of infrasound which has been scientifically documented to cause vast amounts of negative health effects, biological and mechanical stress on a human body. The decibel level of this noise is below the level of human hearing but has been tested and recorded numerous times in recent years by specialized recording equipment and researchers have shown with well-documented peer-reviewed evidence that chronic exposure to infrasound causes~
Cardiovascular Strain: Controlled studies show that intense infrasound can interfere with human myocardial contractility (the ability of the heart muscle to pump).
Organ Resonance: Some frequencies of infrasound resonate with human body cavities. This can induce severe intestinal pain, chest vibration, and general disorientation.
Cellular and Tissue Damage: Prolonged exposure at high intensities can induce oxidative stress, mitochondrial dysfunction, and neuroinflammatory responses.
Vestibular & Auditory Disturbances: Can trigger a sensation of ear pressure, nausea, and dizziness or vertigo. Infrasound is known to directly stimulate inner ear sensory cells.
Sleep Disturbances: Documented insomnia, reduced sleep quality, and general agitation.
Psychological Strain: Heightened irritability, difficulties with concentration, mood changes, and chronic subjective annoyance.
Headaches: A frequently reported physical symptom frequently linked to low-frequency noise.
If folks want more data centers, or want to get rich off them, build them next to golf courses, other sites of exorbitant wealth (where the environment has already been sacrificed), or NEXT TO THE HOMES OF THOSE WHO OWN AND ARE MONETARILY BENEFITING FROM THEM, so they can deal with their health deteriorating instead of us. Why should we be responsible for the mess and trash of the rich? Let them deal with their own consequences for a change please.
thanks
I am against a data center for many reasons: the heavy impact on water, the environment. These centers require millions of gallons of water, which is an obvious hazard, especially with the growth we are seeing. There is noise pollution, health risks. Just because we are a big state does not mean we Need to fill it with terrible ideas and infrastructure. No, out of state company, we don't want your data center. You obviously don't care about the environment, the community, nor the big picture. We don't need AI date centers. This is not a good future.
To the Missoula Consolidated Land Board
No to the special exception applications 1-2=3 and against data scenters that use a tremendous amount of electric power that will most likely cost home and small business owners and renters lots of money.
And also the effects to clean water, and the use of some sort of septic system that will treat used water.
Thank you
Garold Lazarowski
Montana is adamantly opposed to data centers. NO to the Krambu data center. No to rising energy prices, no to contaminated groundwater, and no to 24-hour noise pollution.
Can you guarantee that there will be no negative effects on the surrounding communities? Per the Montana state constitution, Article IX, "The state and each person shall maintain and improve a clean, healthful environment in Montana for present and future generations. "
Is this going to be the next contamination clean-up site in Monatan?
I am opposed to the Krambu Data Center proposed for development at the Bonner Mill site. This is a clear NO in my mind. I see no benefit (and significant risk) for the local community and for Missoula County. The proposed center is a risk to the health and well-being of the Bonner community, the environment, and our water supply. Again, a clear NO. My question is why we are even considering this.
It took over a decade to clean up the contamination left by the Stimson cooling ponds. How long is it going to take to clean up the environmental disaster that this project will obviously leave us with? Krambu is going steal and poison our water, steal our power, and charge us for the privilege. Nobody wants this here. If the county has a shred of integrity they’ll block this.
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This is highly inappropriate for our environment and residents. We don't need a data center! We are in a drought as it is, and they want to make it hotter, take our water from our river, and cause so many other issues that go along with data centers, for what? It's greedy. They should be ashamed of themselves for wanting to spoil such a beautiful place. A place that, mind you, is also on fire for two months and we need that river water? Crazy. We need the snow in the winter to help prevent fires as well, and data centers create so much heat, they literally change the weather. After this past winter, how can this even be a thought? And as for the residents, do you think we can afford our electricity bills to go up any higher than they already are? You put this in, I guarantee alot of the locals will move out. Montana isn't only for the rich! The rest of us matter too! It's too expensive right now! How about your resources go into helping fix that. A new Data center will only cause problems and from what I've seen, everyone opposes this. I will be highly disappointed if this goes through. That idea shouldve been squashed in March.
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This entire project should have been a "NOT IN MONTANA"!!! The answer is simple..... NO, NO, NO!!!! Most Missoula County residents do not want this project and do not need this Data Center for our benefit or in our backyard... so NO!! Our treasured Blackfoot River has been abused enough by home grown Montanans and outsiders for way too long. Could we once and for all stop abusing her with cooling centers for machines, gold mines and other nonsense. Is there any chance that once again we could protect our precious resources for future generations??? I do not know how anyone in favor of this can sleep at night taking on the burden of approving this proposed Data Center.... please explain that to me.
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