Lewis County, ID Flood Zone & Flood Risk Data
Lewis County, ID flood risk explained
Flood hazard in Lewis County sits at the 12th national percentile, among the lowest flood hazard in the country; driven by inland rivers and flash flooding rather than the coast, FEMA's model puts a flood event here at about once every 7 years. This describes the county, not any one street, FEMA only publishes exact parcel zones through a live map service.
Who actually carries the flood insurance FEMA requires
FEMA hasn't published a residential structure count for Lewis County's mapped flood zone, so a reliable mandatory-compliance percentage can't be computed here, see the data quality guide for why this gap exists for roughly a quarter of US counties. Looking beyond the mandated zone, 0.9% of all residential structures in Lewis County carry flood coverage voluntarily or otherwise, relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Lewis County ranks
Among the 3144 US counties FEMA scores for flood hazard, Lewis County ranks 2789, 1 being the highest hazard nationally, and 2904 by population among all 3144 counties covered here, where 1 is the largest. Lewis County, Idaho is home to about 3,728 people across 478.822 square miles of land.
Checking a specific address in Lewis County
16 of Lewis County's 1,856 residential structures carry flood coverage of some kind, per FEMA's latest count, useful context, not a substitute for checking one parcel.
Where Lewis County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Lewis County's compliance figure is one of the ones affected by FEMA's incomplete denominator data, the data quality guide explains what that means and how many counties it touches.