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.