| Floodplain Area |
528,635 acres of high-risk floodplain. |
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Effective and Advisory Floodplains GIS Datasets
Floodplain Area by Region
Floodplain Area by County
Floodplain Area by Community
Floodplain Area by Unincorporated Area
Floodplain Area Risk Indicator Report
Flood Maps: Statewide Effective Floodplain Polygons Description
Non-Regulatory High-Risk Advisory Flood Zones Description
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| Floodplain Area Ratio |
3.4% of total community area lies within the Special Flood Hazard Area. |
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Floodplain Area Ratio by Incorporated Place
Floodplain Area Ratio Risk Indicator Report
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| Floodplain Length |
17,205.1 miles of high-risk floodplain. |
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Floodplain Length by Region
Floodplain Length by County
Floodplain Length by Community
Floodplain Length by Unincorporated Area
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| Floodplain Length Ratio |
0.00111 miles/acre of floodplain length in miles to total community area. |
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Floodplain Length Ratio by Incorporated Place
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| Flood Declared Disasters |
64 flood declared disasters since 1953. |
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Federally-Declared Flood Disasters by County (Natural Break)
Federally-Declared Flood Disasters by County (Percent Rank)
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| Flood Depth Median |
1.8 feet median base flood depth. |
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Building Flood Depth >= 5 ft. (FEMA 1% Flood)
Building Flood Depth >= 10 ft. (FEMA 1% Flood)
Median Flood Depth by County (FEMA 1% Flood)
Median Flood Depth by County (FEMA 1% Flood) Percent Rank Classification
Median Flood Depth by Community (FEMA 1% Flood)
Median Flood Depth by Community (FEMA 1% Flood) Percent Rank Classification
Buildings not building to Design Flood Elevation (BFE plus Freeboard)
Median Flood Depth by Incorporated Place (FEMA 1% Flood)
Median Flood Depth by Incorporated Place (FEMA 1% Flood) Percent Rank Classification
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| Building Floodplain Count |
82,408 buildings in a high-risk flood zone. |
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Buildings in High-Risk Regulatory Zones
Buildings in High-Risk Advisory Zones
Future Buildings Mapped Out of SFHA
Future Buildings Mapped in SFHA
Building Count in SFHA by Region
Building Count in SFHA by Region (Percent Rank)
Building Count in SFHA by County
Building Count in SFHA by County (Percent Rank)
Building Count in SFHA by Community
Building Count in SFHA by Community (Percent Rank)
Building Count in SFHA by Unincorporated Area
Building Count in SFHA by Unincorporated Area (Percent Rank)
Building Count in SFHA by Incorporated Place
Building Count in SFHA by Incorporated Place(Percent Rank)
Buildings in SFHA by Watershed
Building Count in SFHA by Watershed (Percent Rank)
Building Count in SFHA by River/Stream
Building Count in SFHA by River/Stream (Percent Rank)
Highest Substantial Damage Estimates for Top 100 Structures
Building Counts Risk Indicator Report (all scales)
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| Building Floodway Count |
8,237 buildings in the regulatory floodway or main river channel. |
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Building Count Density in Floodway
Floodway Building Count by Region
Floodway Building Count by Region (Percent Rank)
Floodway Building Count by Major Land Resource Area (MLRA)
Floodway Building Ratio by Region
Floodway Building Count by County
Floodway Building Count by County (Percent Rank)
Floodway Building Ratio by County
Floodway Building Count by Community
Floodway Building Count by Community (Percent Rank)
Floodway Building Ratio by Community
Floodway Building Ratio by Unincorporated Area
Floodway Building Ratio by Incorporated Place
Floodway Building Count by Watershed
Floodway Building Count by Watershed (Percent Rank)
Floodway Building Count by River / Stream
Floodway Building Count by River / Stream (Percent Rank)
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| Building Floodplain Ratio |
7.4% of floodplain buildings to total buildings. |
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Floodplain Building Ratio by Region
Floodplain Building Ratio by County
Floodplain Building Ratio by Unincorporated Area
Floodplain Building Ratio by Incorporated Place
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| Building Density |
0.16 buildings/acre density in floodplain. |
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Building Density in SFHA Statewide
Building Density in SFHA by Region
Building Density in SFHA by Major Land Resource Area
Building Density in SFHA by County
Building Density in SFHA by Community
Building Density in SFHA by Unincorporated Area
Building Density in SFHA by Incorporated Community
Building Density in SFHA by Watershed
Building Density by Stream Length
Building Density by Stream Length (Percent Rank)
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| Building Median Value |
$38,200 median building value in floodplain. |
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Building Exposure High Values Single-Family Residential >= $300K
Building Exposure High Values Non-Residential over $24M
Building Exposure High Values Utilities over $15M
Building Exposure High Values >= $300K (Density Map)
Building Exposure High Values Residential 1-4 Units >= $300K (Density Map)
Building Exposure Low Values <= $10K Statewide
Building Exposure Low Values <= $10K by County
Building Median Value by Community
Building Median Value Residential by Community
Building Exposure Low Values <= $10K by Community
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| Bldg. Mobile Homes Ratio |
27.5% of single-family dwellings in floodplain are manufactured homes. |
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Mobile Homes Density Statewide
Mobile Homes Ratio by County
Mobile Homes Ratio by Community
Mobile Homes Count by Community
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| Bldg. Subgrade Basements Ratio |
24.8% of floodplain buildings have subgrade basements. |
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Building Subgrade Basements Density Statewide
Building Subgrade Basement Ratio by County
Building Subgrade Basement Ratio by County (Percent Rank)
Building Subgrade Basement Ratio by Community
Building Subgrade Basement Ratio by Community (Percent Rank)
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| Building 1-Story Ratio |
84.0% of floodplain buildings have only one story. |
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Building One-Story Density Statewide
Building One-Story Ratio by County
Building One-Story Ratio by County (Percent Rank)
Building One-Story Ratio by Community
Building One-Story Ratio by Community (Percent Rank)
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| Bldg. Year Pre-FIRM Ratio |
77.5% of floodplain buildings are Pre-FIRM or built with no FIRM in effect. |
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Building Year Pre-FIRM Building Density
Building Year Pre-FIRM Ratio by Region
Building Year Pre-FIRM Ratio by Region (Percent Rank)
Building Year Pre-FIRM Ratio by County
Building Year Pre-FIRM Ratio by County (Percent Rank)
Building Year Pre-FIRM Ratio by Community
Building Year Pre-FIRM Ratio by Community (Percent Rank)
Building Year Pre-FIRM Ratio by Unincorporated Area
Building Year Pre-FIRM Ratio by Unincorporated Area (Percent Rank)
Building Year Pre-FIRM Ratio by Incorporated Place
Building Year Pre-FIRM Ratio by Incorporated Place (Percent Rank)
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| Bldg. Year Minus Rated Post-FIRM Ratio |
5.8% of floodplain buildings are Post-FIRM with lowest floor below BFE. |
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Building Year FIRM Status of Structures Statewide
Building Year Post-FIRM Minus-Rated Structures >= 3 ft (Top Structure Rank & Graduated Symbols) Statewide
Building Year Post-FIRM Minus-Rated Structures Density Statewide
Building Year Post-FIRM Minus-Rated Building Ratio by Region
Building Year Post-FIRM Minus-Rated Building Ratio by Region (Percent Rank)
Building Year Post-FIRM Minus-Rated Building Ratio by County
Building Year Post-FIRM Minus-Rated Building Ratio by County (Percent Rank)
Building Year Post-FIRM Minus-Rated Building Ratio by Community
Building Year Post-FIRM Minus-Rated Building Ratio by Community (Percent Rank)
Building Year Post-FIRM Minus-Rated Building Ratio by Unincorporated Area
Building Year Post-FIRM Minus-Rated Building Ratio by Unincorporated Area (Percent Rank)
Building Year Post-FIRM Minus-Rated Building Ratio by Incorporated Place
Building Year Post-FIRM Minus-Rated Building Ratio by Incorporated Place (Percent Rank)
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| Essential Facilities |
489 essential facilities in moderate and high risk floodplains. |
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Design Guide for Improving Critical Facility Safety from Flooding and High Winds
Flood Risk Reports for Essential Facilities by Region (2021)
Essential Facilities in High/Moderate-Risk Floodplain GIS Dataset (Building-Level)
From fire departments to hospitals, hundreds of first responder stations face a serious flood risk (Source: Mountain State Spotlight)
Essential Facilities Density Statewide
Essential Facilities in High-Moderate Risk Floodplain by County
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| Roads Inundated Ratio |
6.7% of roads flooded by a 1% annual chance (100-yr) major flood. |
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Roads Inundated Density by 1% Flood Statewide
Roads Inundated Flood Depth Classification for 1% Flood Statewide
Railroads Inundated Flood Depth Classification for 1% Flood Statewide
Bridges Inundated by 1%-annual-chance (100-yr) flood statewide
Roads Inundated Ratio for 1% Flood by Region
Roads Inundated Ratio for 1% Flood by County
Roads Inundated Ratio for 1% Flood by Community
Roads Inundated Ratio for 1% Flood by Unincorporated Area
Roads Inundated Ratio for 1% Flood by Incorporated Place
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| Community Assets Historical |
2,758 historical assets in floodplain. |
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Floodplain Management Bulletin: Historic Structures
Incorporating Historic and Cultural Resources in Your Hazard Mitigation Plan
Guidelines on Flood Adaptation for Rehabilitating Historic Buildings
Historical Community Assets Density Statewide (Density Map)
Historical Community Assets Density Statewide
Historical Community Assets Count by Community
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| Community Assets Non-Historical |
2,092 non-historical assets in floodplain. |
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Flood Resilience: A Basic Guide for Water and Wastewater Utilities
Non-Historical Community Assets Density Statewide
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| Bldg. Substantial Damage Count |
6,493 bldgs. substantially damaged by a 1% annual chance (100-yr) flood. |
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Building Substantial Damage Estimates Count Statewide by Occupancy Class (1% Flood)
Building Substantial Damage Estimates: Top 30 Structures over $496k (1% Flood) (Statewide)
Building Substantial Damage Estimates: Top 125 Single Family (1% Flood) Structures more than $100K (statewide)
Building Substantial Damage Estimates Density Statewide (1% Flood)
Building Substantial Damage Count by Region (1% Flood)
Building Substantial Damage Count by Region (1% Flood) (Percent Rank)
Building Substantial Damage Debris Removal Estimates by County (1% Flood)
Building Substantial Damage Count by County (1% Flood)
Building Substantial Damage Count by County (1% Flood) (Percent Rank)
Building Substantial Damage Count by 284 Communities (1% Flood)
Building Substantial Damage Count by Community (1% Flood) (Percent Rank)
Building Substantial Damage Median Percent Damage Estimates by Community (1% Flood)
Building Substantial Damage Median Damage Dollar Estimates by Community (1% Flood)
Building Substantial Damage Debris Removal Estimates by Community (1% Flood)
Building Substantial Damage Count by Watershed (1% Flood)
Building Substantial Damage Count by Watershed (1% Flood) (Percent Rank)
Building Substantial Damage Count by Stream (1% Flood)
Building Substantial Damage Count by Stream (1% Flood) (Percent Rank)
Building Substantial Damage Estimates: Top 100 Streams (1% Flood)
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| Bldg. Substantial Damage Ratio |
7.9% of buildings in floodplain substantially damaged by major storm. |
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Building Substantial Damage to Total SFHA Structures Ratio by Region (1% Flood)
Building Substantial Damage to Total SFHA Structures Ratio by Region (1% Flood) (Percent Rank)
Building Substantial Damage to Total SFHA Structures Ratio by County (1% Flood)
Building Substantial Damage to Total SFHA Structures Ratio by County (1% Flood) (Percent Rank)
Building Substantial Damage to Total SFHA Structures Ratio by Community (1% Flood)
Building Substantial Damage to Total SFHA Structures Ratio by Community (1% Flood) (Percent Rank)
Building Substantial Damage to Total SFHA Structures Ratio by Watershed (1% Flood) (Percent Rank)
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| Bldg. Previous Damage Claims |
27,882 buildings have prior damage claims. |
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Building Damage Claims Number by County (Natural Break)
Building Damage Claims Number by County (Percent Rank)
Building Damage Claims Number by Community (Natural Break)
Building Damage Claims Number by Community (Percent Rank)
Building Damage Claims Amount by Community (Natural Break)
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| Bldg. Repetitive Loss Structures |
9,698 repetitive loss structures. |
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Building Repetitive Loss Structures Geocoding Statewide
Building Repetitive Loss Structures Density Statewide
Building Repetitive Loss Structures by Community
Building Repetitive Loss Structures by Watershed
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| Population in Floodplain Ratio |
11.0% of the population resides in a high-risk flood zone. |
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| Population Displaced Ratio |
6.6% of population displaced by a 1% annual chance (100-yr) flood event. |
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