Canyon County, ID Flood Zone & Flood Risk Data
Canyon County, ID: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Canyon County scores at the 80.3th percentile for flood hazard, rated "Relatively Moderate", a middling flood hazard by national standards. The hazard here is driven by inland rivers and flash flooding rather than the coast, FEMA's model puts a flood event here at about once every 3 years. That's a county-wide figure, not a per-address one, FEMA's parcel maps are a live lookup, not a bulk file.
Who actually carries the flood insurance FEMA requires
15.1% of the homes FEMA requires to carry flood insurance in Canyon County, those inside the mapped Special Flood Hazard Area, actually have a policy in force: 311 policies against 2,066 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Looking beyond the mandated zone, 0.5% of all residential structures in Canyon County carry flood coverage voluntarily or otherwise, relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Canyon County ranks
Among the 3144 US counties FEMA scores for flood hazard, Canyon County ranks 645, 1 being the highest hazard nationally, and 274 by population among all 3144 counties covered here, where 1 is the largest. Canyon County, Idaho covers 587.049 square miles and counts roughly 266,892 residents.
Checking a specific address in Canyon County
350 of Canyon County's 77,372 residential structures carry flood coverage of some kind, per FEMA's latest count, useful context, not a substitute for checking one parcel.
Where Canyon County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. If you're unsure why any of this insurance requirement exists at all, the SFHA explainer covers it from first principles.