Flood hazard · Yolo County, CA
Flood hazard
To create the beginnings of a vulnerability assessment, this snapshot combines local vulnerability data with maps that depict the 100-year floodplain.
People at RiskRising populations in flood prone areas exacerbate flooding risk. Impacts can be greater to the elderly or those with a low income, as these citizens may not have the resources to adequately prepare or recover.
Sources
Census ACS 5-year estimates (2020–2024) (2024)
Census 2020 tabulation blocks (TIGERweb) (2020)
FEMA National Flood Hazard Layer (2010–2012)
Flooded Facilities Can't Provide Critical ServicesFirst responders. Hospitals. Shelters. All play a central role in response and recovery. Incorporating vulnerability information into planning efforts save lives (fewer instances where critical services are made unavailable) and is cost effective (fewer damages to facilities).
Sources
USGS National Structures Dataset (2026-07-23)
FEMA National Flood Hazard Layer (2010–2012)
Homes at RiskFlooding is costly for homeowners, no doubt. But the community also shares in the cost as lowered property values negatively affect tax revenues.
Sources
OpenFEMA NFIP claims (2026-09-08)
Being Underwater Is Not a Good Business PlanFlood-related losses of services, revenues, and salaries can hit a community hard.
Sources
LEHD LODES8 workplace area characteristics (2023)
Census 2020 tabulation blocks (TIGERweb) (2020)
FEMA National Flood Hazard Layer (2010–2012)
A Better Future is a Greener FutureHow do past development trends in your county compare to today’s approach? Development in flood-prone areas should be kept to a minimum. Creating more greenspace, which acts as a flooding buffer, lowers flood risk. Adding more impervious surfaces (even outside of the floodplain) can increase runoff and exacerbate flooding.
Sources
NOAA C-CAP regional land cover (1996–2021)
FEMA National Flood Hazard Layer (2010–2012)
Sea level rise · Yolo County, CA
Sea level rise
Visualize sea level rise exposure with this snapshot. Consider incorporating this data into all community planning strategies. In many communities, rising sea levels are already increasing the impacts of high tide flooding and storm surge events.
Projections for the Port Chicago tide gauge, assigned to Yolo County. Exposure at 2, 4, 6, 8, 10 ft above MHHW.
People at RiskRising population numbers exacerbate potential flooding risk; impacts can be even greater when social vulnerability factors (age, income, capabilities) are involved, as these citizens may not be able to adequately prepare and respond.
Sources
Census ACS 5-year estimates (2020–2024) (2024)
Census 2020 tabulation blocks (TIGERweb) (2020)
NOAA Sea Level Rise Viewer inundation extents (2026)
Flooded Facilities Can't Provide Critical ServicesFire and police stations. Hospitals. Shelters. These facilities play a central role in response and recovery. Understanding future exposure can help reduce damages and the conditions that make these services unavailable.
Sources
USGS National Structures Dataset (2026-07-23)
NOAA Sea Level Rise Viewer inundation extents (2026)
Being Underwater Is Not a Good Business PlanFlood-related losses of services, revenues, and salaries can hit a community hard.
Sources
LEHD LODES8 workplace area characteristics (2023)
Census 2020 tabulation blocks (TIGERweb) (2020)
NOAA Sea Level Rise Viewer inundation extents (2026)
Creating a Better Future: Yes, It Can Be DoneMake it a goal: more natural areas (wetlands, forests, parks, dunes, etc.) to absorb floodwaters and protect the community, and less development in flood-prone areas. Consider not only today’s floodplain, but also the floodplain extent projected for the future.
Sources
NOAA C-CAP regional land cover (1996–2021)
NOAA Sea Level Rise Viewer inundation extents (2026)
When Is the Time to Act? Now!Because a number of factors are involved, sea level rise projections are often expressed as scenarios. For projects involving structures with a long lifespan or where a loss would be catastrophic (power plants, ports, hospitals), the higher sea level rise scenarios should be considered. For projects with a shorter lifespan (bike paths, golf courses, parks), lower sea level rise scenarios may be appropriate.
Sources
California Ocean Protection Council, State of California Sea Level Rise Guidance: 2024 Science & Policy Update, Appendix 2 (2024)
Total economy
Not available: Not shore-adjacent. NOAA counts this county in its ocean economy list but not among the shoreline counties behind the total economy, so there are no total economy figures for it.
Marine economy · Yolo County, CA
Marine economy
Businesses that are dependent on marine resources are particularly vulnerable to coastal hazards. (Note: “Total coastal economy” refers to all economic activity in the shoreline counties and is covered in the total economy section of this page.)
If You Can't Measure It, You Can't Protect It
Sources
BLS Quarterly Census of Employment and Wages (annual averages) (2025)
BEA GDP by state and industry (SAGDP2), California (2025)
Census ZIP Code Business Patterns and shoreline-adjacent ZIP codes (2023)
Business DiversityUnderstanding the types and amounts of businesses in the marine economy will inform community planning and management initiatives. This graphic highlights the six sectors that make up the marine economy.
Sources
BLS Quarterly Census of Employment and Wages (annual averages) (2025)
BEA GDP by state and industry (SAGDP2), California (2025)
Census ZIP Code Business Patterns and shoreline-adjacent ZIP codes (2023)
WagesUnderstanding wage vulnerability helps leaders better understand the long and short-term impact of coastal storms, economic downturns, etc. Lower wage sectors are usually affected the most.
Sources
BLS Quarterly Census of Employment and Wages (annual averages), wages comparison year (2024)
NOAA Open ENOW (California and All Coastal States) (2024)
Census ZIP Code Business Patterns and shoreline-adjacent ZIP codes (2023)
Total JobsMany economic reports don't include the self-employed in their job numbers, yet this group can play an important role in the local economy. Most commercial fishermen, for instance, are self-employed.
Sources
BLS Quarterly Census of Employment and Wages (annual averages) (2025)
Census ZIP Code Business Patterns and shoreline-adjacent ZIP codes (2023)
NOAA ENOW self-employed workers (2021)
Data and methods
- Snapshot
- 2026-10-22
- Methodology
- Version 1. What changed: https://seachangeatlas.org/county-profiles/about/changelog/#methodology-changelog
- Estimates
- Some figures are estimated with NOAA's Open ENOW method, and some are withheld. How estimates are made: https://seachangeatlas.org/county-profiles/about/economy/#estimated. Why figures are withheld: https://seachangeatlas.org/county-profiles/about/economy/#withheld-reasons
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