Alaska coastal flooding risk

26 counties scored 0 rated Very High

Juneau City and Borough has the highest coastal flooding risk in Alaska, scoring 38 out of 100 — rated "Very Low" by FEMA's National Risk Index.

#	County	NRI score	Rating
1	Juneau City and Borough	38	Very Low
2	Sitka City and Borough	34	Very Low
3	Kenai Peninsula Borough	33.8	Very Low
4	Anchorage Municipality	28	Very Low
5	Ketchikan Gateway Borough	26	Very Low
6	Hoonah-Angoon Census Area	22.8	Very Low
7	Chugach Census Area	20.8	Very Low
8	Aleutians East Borough	0	No Rating
9	Aleutians West Census Area	0	No Rating
10	Bethel Census Area	0	No Rating
11	Bristol Bay Borough	0	No Rating
12	Copper River Census Area	0	No Rating
13	Dillingham Census Area	0	No Rating
14	Haines Borough	0	No Rating
15	Kodiak Island Borough	0	No Rating
16	Kusilvak Census Area	0	No Rating
17	Lake and Peninsula Borough	0	No Rating
18	Matanuska-Susitna Borough	0	No Rating
19	Nome Census Area	0	No Rating
20	North Slope Borough	0	No Rating
21	Northwest Arctic Borough	0	No Rating
22	Petersburg Borough	0	No Rating
23	Prince of Wales-Hyder Census Area	0	No Rating
24	Skagway Municipality	0	No Rating
25	Wrangell City and Borough	0	No Rating
26	Yakutat City and Borough	0	No Rating

Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.

Coastal Flooding risk nationally:

Top 50 US counties

Other hazard risks in Alaska:

Wildfire Inland Flooding Earthquake Heat Wave Tornado Hurricane Hail Strong Wind Winter Weather Ice Storm Cold Wave Lightning Drought Landslide Avalanche Tsunami Volcanic Activity

Frequently asked questions

What is the highest coastal flooding risk county in Alaska?

Juneau City and Borough, AK has the highest coastal flooding risk in Alaska, with a FEMA National Risk Index score of 38 out of 100 (rated "Very Low").

What causes coastal flooding risk in Alaska?

Coastal flooding scores cover storm surge, wave action, and tidal flooding along the Gulf, Atlantic, and Pacific coasts, and Great Lakes shoreline. Inland flooding is scored separately. Counties with "Not Applicable" ratings have no significant coastal exposure. Coastal flood events are reported at zone level in NOAA Storm Events and are not included in county-level counts.