310 permits in Flathead County, Montana

Planning work in or near a stream in Flathead County? A culvert, a bridge, bank work, a ford, riprap, or clearing the channel all need a 310 permit from the local conservation district before you start. Here is who to call.

What to expect

• Call first. Describe the project before you plan it in detail. The district will tell you whether it needs a permit and send you the application, which is Montana's Joint Application for work in streams.
• Cost. DNRC's Joint Application instructions list the 310 permit as no fee, and districts such as Gallatin say it is free. DNRC also says a fee may apply in some places, so ask.
• Timing. A review team makes recommendations, and the district board has 60 days from accepting your application to approve, modify or deny it. Apply well ahead of when you want a machine in the water.
• Other permits. Some stream work also needs federal or other state permits. The district can tell you, and our 310 permit guide explains which, and what skipping a permit costs.

When the board meets: 310 meeting 2nd Monday 1 pm; business meeting 4th Monday 1 pm. 310 applications are decided by the district board, so ask when the next meeting is and how far ahead they need your application.

Sources, checked October 30, 2026: Montana DNRC and Montana Association of Conservation Districts, Conservation District Directory; DNRC conservation district and county boundary maps; DNRC Stream Permitting; Joint Application instructions; district websites where available. Contact details change; if a number is wrong, the DNRC Conservation Districts Bureau is at (406) 444-6667.