Larimer County floodplain work can need a permit before the work starts

Floodplain work in Larimer County is not only a building question, and treating it as one is how projects get stalled. Development or construction activity in a designated floodplain area typically requires a floodplain development permit before anything begins. These rules are not red tape for its own sake; they are part of how the county manages flood risk and protects both public safety and property downstream.

The reach of that is wider than people expect. A new house is the obvious case, but grading, fill, paving, excavation, bridges, culverts, and changes near a waterway can all raise floodplain questions of their own. Moving dirt can count, even when no walls go up.

Anyone in this county has reason to take the risk seriously. The 1976 flood on the Big Thompson and the 2013 flooding across the Front Range are not distant history here, and the maps reflect what those waters can do.

If you are looking at land in a canyon, near a creek, along the Big Thompson or Poudre, or anywhere inside a mapped floodplain, find out where the floodplain line falls and whether the project needs county review. The county’s floodplain development permit page is where that answer starts.