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Bozeman adopts tougher wetlands protections, sets 25-foot minimum buffer
Summary
After hours of questions and public comment, the Bozeman City Commission adopted revisions to its wetlands and watercourse code that tighten delineation, submittal, and mitigation rules and set a 25-foot minimum wetland buffer; the change passed unanimously after an amendment raised the buffer from staff’s 10-foot proposal.
The Bozeman City Commission on Sept. 9 adopted a comprehensive update to the city’s wetlands and watercourse regulations, including a new minimum wetland buffer of 25 feet and stricter submittal and mitigation requirements.
The commission voted unanimously to approve the ordinance after a lengthy presentation from city staff and more than two hours of public comment. Staff had proposed a minimum 10-foot buffer as a baseline but described a suite of higher-level protections — including required professional delineation reports, a five‑year maximum age for delineations, licensed-surveyor mapping and an ordering of mitigation priorities that favors on-site and locally prioritized wetland-bank credits.
Supporters said the changes close gaps left by recent federal court decisions and will help the city protect small, isolated wetlands. “This code gives us a better ability to protect those isolated wetlands that would have been left without regulatory oversight,” said Nick Ross, the city’s project manager for the code update, during the presentation. He described the revisions as a way to “enhance protection of aquatic resources in a manner compatible with sustainable urban development.”
Members of the public and regional conservation groups urged stronger, clearer buffers. “At a minimum, I would recommend applying a 50-foot setback to isolated wetlands,” said Lily McLean of the Gallatin Watershed Council, arguing the longer distance better captures pollutant removal and flood-attenuation functions. Wetland scientists at the hearing urged site-specific functional assessments and clearer mitigation-ratio guidance.
Commissioners and staff discussed how the code balances defensibility, administrative feasibility and urban-growth needs. City Attorney Greg [transcript: S19] and staff advised the commission that many of the technical judgements required by the ordinance — for example, evaluating departures or variances based on hydrology and habitat function — would be made at the administrative level by the development review committee with consultant input, not by the commission itself.
Commissioner Fisher moved an amendment raising the minimum automatic wetland buffer in Section 38.610.08(b) from the staff-recommended 10 feet to 25 feet; the commission adopted that amendment unanimously before passing the ordinance. The final code continues to allow the review authority to require a larger buffer when site-specific delineation and functional analysis justify it.
The ordinance also clarifies mitigation sequencing, prioritizing on-site avoidance and mitigation, then local wetland-bank credits within the East Gallatin watershed, with regional options only when local credits are unavailable. Staff said the code intends to incentivize local mitigation without asserting regulatory power the city does not possess over federal Army Corps of Engineers permitting.
The commission signaled it expects follow-up work. Commissioners asked staff to return with more specifics on how mitigation credits are valued by distance, additional guidance on functional assessments and whether wetlands and watercourse setback language could be consolidated in future updates.
The ordinance takes effect according to the implementation timeline in the code once publication and any administrative steps are complete. The vote was unanimous.
