Indiana coastal flooding risk
Lake County has the highest coastal flooding risk in Indiana, scoring 41.2 out of 100 — rated "Very Low" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Lake County | 41.2 | Very Low |
| 2 | LaPorte County | 29 | Very Low |
| 3 | Porter County | 27.4 | Very Low |
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:
Other hazard risks in Indiana:
Frequently asked questions
What is the highest coastal flooding risk county in Indiana?
Lake County, IN has the highest coastal flooding risk in Indiana, with a FEMA National Risk Index score of 41.2 out of 100 (rated "Very Low").
What causes coastal flooding risk in Indiana?
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.