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FEMA flood zones · Alaska

Yukon-Koyukuk Census Area, Alaska Flood Zone Map

72 flood insurance claims·$3.3M paid·8 federal flood & hurricane disasters

Less than 1% of Yukon-Koyukuk Census Area’s area is in FEMA’s high-risk flood zones.

Share of the whole county outline, rivers and lakes included; parts FEMA hasn’t mapped count as zero.

Coastal high risk (V, VE)FloodwayHigh risk (A, AE)Moderate (X, 500-year)Minimal (X)Undetermined (D)

Shaded areas are FEMA’s mapped flood hazard zones in and around Yukon-Koyukuk Census Area, Alaska. Zoomed out they are simplified; at street level the map switches to FEMA’s exact layer. Tap anywhere to check that spot, or search an address above.

Where the flood claims came from

4% of Yukon-Koyukuk Census Area’s flood insurance claims were on properties rated outside FEMA’s high-risk zones.

68 NFIP claims with a recorded rated flood zone, 1978 to date. The zone is the one FEMA used to rate that policy, which may not match today’s map. Source: OpenFEMA NFIP claims.

How deep the water got

outlet80″ door12″24″36″48″60″72″84″

In flood insurance claims here that reported a flood depth, the average was 12 inches.

Drawn to scale against an 80-inch door. Even a few inches soaks flooring, the bottom of the drywall and anything plugged in near the floor.

Average of the depths reported on claims (zero and implausible values left out); FEMA’s record doesn’t say exactly where each depth was measured. Source: OpenFEMA NFIP claims.

Flood claims, year by year

The worst year was 2013, with 33 claims and $3.0M paid, the year of Flooding.

1984: 1 claims1992: 21 claims2005: 1 claims2008: 10 claims2011: 1 claims2013: 33 claims2014: 4 claims2020: 1 claims19801990200020102020

Bar height is scaled by square root so ordinary years stay visible next to the worst one. NFIP claims by year of loss. Source: OpenFEMA.

Federal disasters

21 federal disaster declarations since 1986, 8 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Storms, Flooding, And Remnants Of Typhoon HalongOct 8, 2025
Nenana Ridge ComplexJul 4, 2025
FloodingMay 12, 2023
Clear FireJun 21, 2022
Severe Winter Storm And Straight-line WindsDec 25, 2021
FloodingMay 17, 2013
Flooding And Ice JamsApr 28, 2009
Severe Storms, Flooding, Landslides, And MudslidesJul 27, 2008

Weather and water disasters only; most recent first. Source: OpenFEMA Disaster Declarations.

The zones you’ll see on the map

Every colour on the map above is a place on this drawing: where the ground sits relative to the flood FEMA plans for.

Cross-section of a river floodplainDiagram: a river valley. The floodway is the channel and the land beside it; the 1%-annual-chance flood surface (the base flood elevation) covers the valley floor as zone A or AE; a narrow band higher up is shaded X, the 0.2% floodplain; higher ground is X.0.2% CHANCE A YEAR (500-YEAR)BASE FLOOD ELEVATION · 1% A YEARXAEFloodwayAEX
  1. A / AE Inside the 1%-a-year floodplain: about a 26% chance of flooding over a 30-year mortgage. AE has a mapped base flood elevation; plain A does not.
  2. Floodway The channel and the land beside it that has to be kept clear enough to carry the flood. Building here is tightly limited.
  3. X shaded The 0.2% (500-year) floodplain, plus some levee-protected and very shallow flood areas.
  4. X Outside both lines. No federal requirement to insure, which is not the same as no risk.

Every flood zone code explained →

Flood insurance in Yukon-Koyukuk Census Area

If a building in Yukon-Koyukuk Census Area is in a high-risk zone (A or V) and its mortgage comes from a federally regulated or insured lender, or is federally backed, flood insurance is required.

Outside those zones it is optional, and often worth having: from 2014 to 2024 nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area. Since Risk Rating 2.0, NFIP premiums are set for each building, so the only reliable price is a quote: FloodSmart.gov or a local agent.