Stormwater plan update highlights infrastructure gaps in Kalispell, Mont., system

An updated stormwater plan has identified significant capacity gaps in Kalispell’s drainage system, Daily Inter Lake reported, with roughly one-third of underground pipes unable to handle a 10-year storm under current engineering standards.

City officials said the findings, based on new modeling using GIS, soil surveys and LiDAR data, will guide infrastructure upgrades through 2045, including larger pipes, new trunk lines, culvert improvements and expanded channel capacity.

The plan also flagged underperforming stormwater storage facilities—many privately owned—due to sediment buildup and overgrown vegetation, as well as localized flooding hotspots across the system, Daily Inter Lake reported.

Officials said future projects will be phased based on available funding, with priority given to areas experiencing repeated flooding or system constraints. A public hearing on the plan is scheduled for April 6.

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