How much flood risk does Owyhee County actually carry?
Owyhee County lands at the 58.7th percentile of FEMA's National Risk Index for flooding, "Relatively Low" territory — below the national norm for flood hazard — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 1 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
Owyhee County is one of the counties where FEMA's own denominator for mandated flood-zone structures is missing, so no compliance rate is shown rather than a guessed one — the data quality guide covers how common this is. Across all residential structures in Owyhee County, not just the ones FEMA mandates, 0.1% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Owyhee County ranks
Owyhee County sits at rank 1360 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2238 of 3144 by population (1 is biggest). About 12,748 people live in Owyhee County, Idaho, spread over 7,668.204 square miles.
Checking a specific address in Owyhee County
Across all of Owyhee County's 5,519 residential structures, 3 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Owyhee County's numbers. See the data quality guide for why Owyhee County, like hundreds of other counties, doesn't get a clean compliance percentage.