Natural Disasters in Sioux City, IA

Hazard risk, disaster history, and FEMA data

Natural Hazard Risk

Source: FEMA National Risk Index

Risk Score

83.3

Relatively Moderate

Expected Annual Loss

84.0

Score (0-100)

Social Vulnerability

39.4

Score (0-100)

Community Resilience

87.8

Score (0-100)

Top Hazard Risks

Tornado96.5Hail95.0Drought90.5

Hazard	Risk Score
Tornado	96.5
Hail	95.0
Drought	90.5
Wildfire	87.4
Cold Wave	87.1
Winter Weather	85.7
Ice Storm	85.6
Strong Wind	84.1
Landslide	84.0
Heat Wave	83.2
Lightning	51.7
Earthquake	30.8

Scores range from 0 (lowest risk) to 100 (highest risk) relative to all U.S. communities. Data from FEMA National Risk Index.

Disaster Declarations

Source: FEMA OpenFEMA

Total Declarations

Most Recent

Winter Storm

May 2025

Most Common Type

Flood

7 declarations

Date	Type	Declaration
May 21, 2025	Winter Storm	SEVERE WINTER STORM
Jun 24, 2024	Severe Storm	SEVERE STORMS, FLOODING, STRAIGHT-LINE WINDS, AND TORNADOES
Mar 23, 2020	Biological	COVID-19 PANDEMIC
Mar 13, 2020	Biological	COVID-19
Mar 23, 2019	Flood	SEVERE STORMS AND FLOODING
Aug 20, 2018	Severe Storm	SEVERE STORMS, TORNADOES, STRAIGHT-LINE WINDS, AND FLOODING
Jul 24, 2014	Flood	SEVERE STORMS, TORNADOES, STRAIGHT-LINE WINDS, AND FLOODING
Jun 27, 2011	Flood	FLOODING
Feb 25, 2010	Severe Storm	SEVERE WINTER STORMS AND SNOWSTORM
Mar 30, 2007	Snowstorm	SNOW
Sep 10, 2005	Hurricane	HURRICANE KATRINA EVACUATION
Jul 22, 1999	Severe Storm	SEVERE STORMS AND FLOODING
Aug 21, 1996	Severe Storm	SEVERE STORMS, AND FLOODING
Jul 9, 1993	Flood	SEVERE STORMS & FLOODING
Dec 26, 1991	Severe Ice Storm	ICE STORM
May 26, 1990	Flood	SEVERE STORMS & FLOODING
Apr 25, 1969	Flood	FLOODING
Apr 22, 1965	Flood	FLOODING

Individual Assistance

Source: FEMA Housing Assistance

Total IA Registrations

1,946

Total IA Distributed

$9,827,563

Repair/Replace

$5,572,279

Rental Assistance

$1,121,517

Disaster	Registrations	Total IA $	Avg Damage
DR-4557	1	N/A	—
DR-1998	1	N/A	—
DR-4807	209	$3,066,518	$24,986
DR-4796	217	$2,465,772	$12,706
DR-1984	771	$2,081,172	$1,938
DR-4483	265	$1,534,573	—
DR-4421	339	$381,223	$840
DR-4013	126	$229,756	$3,633
DR-4521	16	$61,057	—
DR-4527	1	$7,492	—

Individual and household assistance for homeowners and renters affected by federally declared disasters.

Flood Insurance (NFIP)

Source: FEMA NFIP

Total Claims

294

Total Claims Paid

$1,934,309

Avg Claim Payout

$6,579

County-level NFIP data from FEMA National Flood Insurance Program.

Disaster Recovery Spending

Source: FEMA Public Assistance

Total Federal Spending

$30,714,049

Disasters with PA

Total Projects

239

Disaster	Type	Projects	Federal $
DR-4421	Severe Storm(s)	73	$14,658,234
DR-4483	Biological	45	$9,598,250
DR-4796	Flood	42	$3,043,326
DR-1998	Flood	53	$2,871,901
DR-4386	Severe Storm(s)	2	$311,070
DR-1282	Severe Storm(s)	24	$231,269

Hazard Mitigation

Source: FEMA Hazard Mitigation Assistance

Mitigation Projects

Federal Funding

$21,211

Avg Benefit-Cost Ratio

0.00

BCR

Top Mitigation Project Types

Project Type	Projects	Federal $
91.1: Local Multihazard Mitigation Plan	7	$21,211
600.1: Warning Systems (as a Component of a Planned, Adopted, and Exercised Risk Reduction Plan)	1	$0

Federally funded projects to reduce future disaster risk. Only includes completed or obligated projects.

Sioux City has a relatively moderate overall natural hazard risk rating according to FEMA's National Risk Index. The top hazard risks are tornado, hail, drought. The area has had 18 federal disaster declarations. The most common disaster type is flood (7 declarations). 294 flood insurance claims have been filed in the area. FEMA has obligated $30,714,049 in public assistance recovery funding. $9,827,563 has been distributed in individual assistance to disaster-affected residents. 8 hazard mitigation projects have been funded to reduce future risk.