Flood risk assessment reveals potential challenges for Clark Fork River berms

During the Smurfit Stone Community Advisory Group meeting on May 1, 2025, significant discussions centered on flood risk management along the Clark Fork River and its implications for local infrastructure. Experts highlighted historical flood data, emphasizing the need for proactive measures to safeguard the community against potential flooding events.

The meeting revealed that the two highest recorded flood flows in the area occurred in 1996 and 2018, with peak flows reaching approximately 55,000 cubic feet per second (CFS). These events underscored the importance of maintaining the river's berms, which are crucial for flood protection. The Clark Fork River's main berm stretches about four miles, supplemented by intermediate berms around individual ponds.

Participants reviewed estimates of potential flood flows, noting that historical data from the U.S. Geological Survey indicated significant risks. For instance, a 500-year flood event could produce flows of around 10,000 CFS, with a nearly 10% chance of occurring within the next 50 years. In contrast, the likelihood of a 50-year flood is approximately 63%, necessitating long-term planning and infrastructure resilience.

The discussions also included a call for comprehensive flood management strategies, considering the community's vulnerability to high water events. As the meeting concluded, members emphasized the importance of preparing for future flooding scenarios to protect both residents and local ecosystems. The insights shared during this meeting will guide ongoing efforts to enhance flood preparedness and response in Missoula.