The South Platte can flood, so check the floodplain before you buy near it

Most days the South Platte River through Logan County looks calm, even shallow. That can be misleading. The river drains a huge area of Colorado’s Front Range and plains, and when big storms hit upstream, the water has to go somewhere, and it comes downstream to the valley around Sterling.

That is not just theory. In September 2013, heavy rain across northern Colorado pushed the South Platte far above its normal level, and the high water moved all the way down to the Sterling area and beyond, flooding farmland and damaging roads and property in the lower valley.

For a buyer, the lesson is simple: near any river, the flood-zone status of a specific parcel matters. A home in the mapped floodplain can face different building rules and may require flood insurance, which is separate from a normal homeowners policy. Two properties a short distance apart can sit on different sides of that line.

So before you commit to a place near the South Platte or one of its tributaries, look up the parcel on the federal flood maps and ask the county about local floodplain rules. It is a quick check that can save a lot of trouble.

You can look up a property’s flood zone on FEMA’s Flood Map Service Center, and the U.S. Geological Survey documents past South Platte flooding.