Ketchikan Gateway Borough, AK: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Ketchikan Gateway Borough scores at the 26th percentile for flood hazard, rated "Very Low" — among the lowest flood hazard in the country. The hazard here is driven by coastal storm surge rather than inland rivers — FEMA's model puts a surge event here at about once every 83 years. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Ketchikan Gateway Borough's flood-insurance compliance gap
FEMA hasn't published a residential structure count for Ketchikan Gateway Borough'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, 1.5% of all residential structures in Ketchikan Gateway Borough carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Ketchikan Gateway Borough ranks
Among the 3144 US counties FEMA scores for flood hazard, Ketchikan Gateway Borough ranks 2374 — 1 being the highest hazard nationally — and 2177 by population among all 3144 counties covered here, where 1 is the largest. About 13,677 people live in Ketchikan Gateway Borough, Alaska, spread over 4,857.091 square miles.
Checking a specific address in Ketchikan Gateway Borough
Across all of Ketchikan Gateway Borough's 4,138 residential structures, 60 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Ketchikan Gateway Borough's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Ketchikan Gateway Borough'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.