Alpine County, CA flood risk explained
Flood hazard in Alpine County sits at the 11.2th 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 9 years. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Alpine County's flood-insurance compliance gap
FEMA hasn't published a residential structure count for Alpine 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, 1.4% of all residential structures in Alpine County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Alpine County against the rest of the country
Among the 3144 US counties FEMA scores for flood hazard, Alpine County ranks 2812 — 1 being the highest hazard nationally — and 3104 by population among all 3144 counties covered here, where 1 is the largest. Alpine County, California covers 738.34 square miles and counts roughly 1,099 residents.
Your street may differ from Alpine County's average
Across all of Alpine County's 939 residential structures, 13 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Alpine County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Alpine 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.