Yukon-Koyukuk Census Area, AK
FEMA National Risk Index scores, disaster declarations & hazard data
Yukon-Koyukuk Census Area has experienced 21 federally declared disasters since 1987, most recently Severe Storms, Flooding, And Remnants Of Typhoon Halong in 2026. Its overall natural hazard risk is rated Relatively Low — lower risk than most US counties.
Yukon-Koyukuk Census Area's highest-rated hazards are cold wave, landslide, and wildfire, with its top risk rated "Relatively High" by FEMA's National Risk Index. Community vulnerability is elevated (88th percentile nationally), suggesting residents may face greater difficulty recovering from major disasters.
Past disasters & FEMA designations
A federal disaster declaration officially designates a county for FEMA disaster assistance. Yukon-Koyukuk Census Area has been designated in 21 declarations since 1987, covering 7 disaster types including flood (8), biological (4), fire (3).
| Year | Type | Event name |
|---|---|---|
| 2026 | Flood | Severe Storms, Flooding, And Remnants Of Typhoon Halong |
| 2025 | Fire | Nenana Ridge Complex |
| 2023 | Flood | Flooding |
| 2022 | Severe Storm | Severe Winter Storm And Straight-Line Winds |
| 2022 | Fire | Clear Fire |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 |
| 2013 | Flood | Flooding |
Showing the 10 most recent of 21 total declarations since 1987.
Source: FEMA OpenFEMA Disaster Declarations Summaries. A single disaster can produce more than one record per county. Data current through September 2026.
Risk by hazard type
| Hazard | Risk rating | Risk score | Recorded events | Deaths | Prop. damage |
|---|---|---|---|---|---|
| Wildfire | Relatively Moderate | 93 | 0 | 0 | — |
| Inland Flooding | Very Low | 6.6 | 0 | 0 | — |
| Coastal Flooding | Not Applicable | — | 0 | 0 | — |
| Earthquake | Relatively Low | 75.3 | 63 | — | — |
| Heat Wave | Insufficient Data | — | 0 | 0 | — |
| Tornado | Very Low | 0.7 | 0 | 0 | — |
| Hurricane | Not Applicable | — | 0 | 0 | — |
| Hail | Very Low | 0.7 | 0 | 0 | — |
| Strong Wind | Very Low | 0.9 | 0 | 0 | — |
| Winter Weather | Relatively Moderate | 79.6 | 0 | 0 | — |
| Ice Storm | Very Low | 19.4 | — | — | — |
| Cold Wave | Relatively High | 97.3 | — | — | — |
| Lightning | Very Low | 13.6 | 0 | 0 | — |
| Drought | No Rating | 0 | 0 | 0 | — |
| Landslide | Relatively Moderate | 94.8 | 0 | 0 | — |
| Avalanche | Relatively Moderate | 84.1 | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic Activity | Very Low | 40.4 | — | — | — |
Scores are 0–100 percentiles relative to all US counties — higher means more exposed, not that a disaster is likely this year. Event counts: NOAA Storm Events 2016–2026; earthquake counts from USGS ComCat (M3.0+, 1996–2026). See the methodology page for details.
Community vulnerability
Yukon-Koyukuk Census Area ranks in the 88th percentile (High) for community vulnerability — a measure of how hard disaster impacts tend to hit residents. Higher vulnerability means more displacement, worse health outcomes, and slower recovery after a disaster.
| SVI theme | Percentile | Vulnerability level |
|---|---|---|
| Overall | 88th | High |
| Socioeconomic status | 84th | High |
| Household characteristics | 74th | Moderate |
| Racial & ethnic minority status | 98th | High |
| Housing type & transportation | 80th | High |
Source: CDC/ATSDR Social Vulnerability Index 2022. Percentiles compare counties nationally — higher means more vulnerable relative to other counties. See CDC SVI for full methodology.
Future risk outlook
| Wildfire metric | National percentile | Level |
|---|---|---|
| Burn probability | 94th | Very High |
| Risk to homes | 95th | Very High |
| Buildings in direct exposure zone | 56.5% | — |
Wildfire: USDA Forest Service Wildfire Risk to Communities (RDS-2020-0016-2) — modeled values, not annual forecasts. See wildfirerisk.org. Inland flood and heat projections pending data availability; coastal sea-level projections are available for select coastal counties below — see the data page.
Nearby counties
Frequently asked questions
What natural hazards pose the greatest risk in Yukon-Koyukuk Census Area?
According to the FEMA National Risk Index, the highest-risk hazards in Yukon-Koyukuk Census Area, Alaska are cold wave, landslide, and wildfire. The county's overall natural hazard risk is rated Relatively Low — lower risk than most US counties.
Has Yukon-Koyukuk Census Area received federal disaster declarations?
Yes. Yukon-Koyukuk Census Area has received 21 federal disaster declarations since 1987, including declarations in 2026. The most common disaster type on record is flood (8 declarations).
Has Yukon-Koyukuk Census Area had any FEMA disaster declarations in 2024, 2025, or 2026?
Yes. Recent federal disaster declarations for Yukon-Koyukuk Census Area include Severe Storms, Flooding, And Remnants Of Typhoon Halong (2026), Nenana Ridge Complex (2025). See the declarations table above for the full history since 1987.
How does Yukon-Koyukuk Census Area's natural hazard risk compare to nearby counties?
Among neighboring counties, Matanuska-Susitna Borough, AK has the highest overall natural hazard risk (Relatively Moderate) and North Slope Borough, AK has the lowest (Very Low). Yukon-Koyukuk Census Area is rated Relatively Low overall.
How is Yukon-Koyukuk Census Area's composite disaster risk index calculated?
Yukon-Koyukuk Census Area's composite disaster risk index — officially FEMA's National Risk Index (NRI) — scores every US county on a 0–100 percentile scale across 18 natural hazard types, factoring in expected annual loss, social vulnerability, and community resilience. Yukon-Koyukuk Census Area's composite score of 62 means its overall natural hazard risk is higher than 62% of US counties.