Photo: John Pilge · Public domainFEMA expects more hazard damage per building in Boulder Creek than almost anywhere in the U.S., mostly from river and rain flooding
On FEMA’s National Risk Index, Boulder Creek gets a D− for hazard risk: among the highest expected damage per building of U.S. towns, #824 of 847 in California. Most of that expected damage is river and rain flooding (66%), then earthquakes (24%). Flood insurance has paid 34 claims here since 1982.
Graded on FEMA’s expected yearly building damage per dollar of building value (NRI v1.20, December 2025), weighted by where residents live; flood claims are shown, not graded. How hazard risk is graded
What stands out about Boulder Creek’s natural hazards
From FEMA’s model and FEMA’s records, below.
What Boulder Creek faces
Each hazard’s share of the building damage FEMA expects here, and how its rate compares with the rest of the country.
River and rain flooding
Earthquakes
Wildfire
Shares are of FEMA’s expected building damage, the measure the grade uses; ranks compare each hazard’s building-damage rate with all 85,154 U.S. census tracts. In FEMA’s terms, river and rain flooding is FEMA’s “Inland Flooding” (rivers and streams overflowing their banks, or rain overwhelming drainage). FEMA defines coastal flooding as high or rising tides and storm surge, so surge damage is counted there. Drought isn’t listed: FEMA counts its losses in crops only.
What’s behind Boulder Creek’s grade
River and rain flooding is 66% of the building damage FEMA expects in Boulder Creek, and Boulder Creek’s rate of river and rain flooding damage is in the top 1% of U.S. census tracts. Earthquakes add 24%, at a rate in the top 5% of U.S. census tracts.
D− #824 of 847 in California; among the highest expected damage per building of U.S. towns (21,298).
Boulder Creek’s residents live in 3 census tracts; FEMA’s figures are combined by where they live.
The typical California town has higher expected damage than 92% of U.S. towns; within the state, Boulder Creek has more expected damage per building than 97% of California towns.
In dollars, FEMA expects about $8.1M a year in losses across Boulder Creek: $7.3M to buildings, the rest to people and crops.
Does Boulder Creek flood? Sometimes: 34 flood claims since 1982
Every paid claim on a federal flood insurance policy in Boulder Creek, from FEMA’s records: 15.4 per 1,000 homes, more than 81% of the 13,809 U.S. towns with a flood insurance record.
- The Pineapple Express - Southern18 claims · $261K
- The California Atmospheric River3 claims · $19K
Boulder Creek isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Santa Cruz County.3 federal disasters brought FEMA money to Boulder Creek
Disasters that paid out in Boulder Creek itself (aid to households or repair grants to Boulder Creek), newest first, with that year’s flood claims.
- 2023Severe Winter Storms, Straight-line Winds, Flooding, Landslides, and Mudslides243 households applied for aid$1.4M aid approved3 flood claims paid that year
- 2022Severe Winter Storms, Flooding, Landslides, and Mudslides368 households applied for aid$2.6M aid approved
- 2020Wildfires2,054 households applied for aid$2.9M aid approved
Santa Cruz County has had 24 natural disasters declared by the President since 1953, most often severe storms, then floods. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.
Also 6 FEMA wildfire suppression grants (Fire Management Assistance, not a disaster declaration) for fires in Santa Cruz County, 2002–2020.
Old photos of Boulder Creek after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Boulder Creek archive →Boulder Creek and its neighbors
Boulder Creek is 2nd of the 2 graded towns here, from least expected damage per building to most. Tap a town to see its hazards.
| Town | Hazard risk | Mostly (buildings) | Flood claims |
|---|---|---|---|
| Brookdale | D−among the highest damage | river and rain flooding | 17 |
| Boulder Creek | D−among the highest damage | river and rain flooding | 34 |
Hazard risk = FEMA’s expected yearly building damage per dollar of building value, vs. the 21,298 U.S. towns we grade; the map is shaded by fifths of the same scale. Flood claims = paid federal flood insurance claims on record.
Get ready for what Boulder Creek faces
A short kit for the hazards that drive the building damage here, what to check before you buy, and where neighbors get alerts.
- Turn around at flooded roads: a foot of moving water can carry off a car.
- Flood insurance usually takes 30 days to start, so buy it before the forecast.
- Keep papers and medicines up high, in a grab-and-go bag.
- Drop, cover and hold on.
- Strap tall furniture and the water heater to the wall.
- Know how to shut off the gas.
- Clear dead leaves and brush within 5 feet of the house.
- Sign up for local alerts and know two ways out.
- Keep N95 masks for smoky days.
- Look up the address on FEMA’s flood map.
- Ask the seller or landlord whether it has ever flooded, and what flood insurance costs there.
- Get a flood insurance quote early: policies usually start 30 days after you buy.
Know where neighbors sign up for alerts? Add it to the Handbook so everyone has it.
Questions about natural hazards in Boulder Creek
Is Boulder Creek at risk for natural disasters?
On FEMA’s National Risk Index, Boulder Creek has among the highest expected damage per building of U.S. towns: D− for hazard risk, #824 of 847 in California. Most of the expected damage is river and rain flooding (66%) and earthquakes (24%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Boulder Creek flood?
Flood insurance has paid 34 claims in Boulder Creek since 1982, $509K in all, or 15.4 per 1,000 homes, more than 81% of U.S. towns with a flood insurance record. The most claims came from Pineapple Express - Southern (18).
Is Boulder Creek in a flood zone?
Flood zones are drawn street by street, so the answer depends on the address: look it up on FEMA’s flood map. In Santa Cruz County, 33% of homes in mapped flood zones carry federal flood insurance, and 2.5% of all homes do.
How much is flood insurance in Boulder Creek?
FEMA’s Community Rating System list shows no discount for Boulder Creek’s flood program. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
What was the biggest storm in Boulder Creek?
By FEMA money that reached Boulder Creek, Wildfires (2020): 2,054 households applied for aid, $2.9M approved. By flood claims, Pineapple Express - Southern: 18 paid, $261K.
Is Boulder Creek at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (66%), and Boulder Creek’s rate for it is in the top 1% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Boulder Creek.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Boulder Creek’s residents lived in the 2020 census; OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Homes: Census ACS 2020–24. Preparedness tips: Ready.gov. FEMA’s model is an average of expected damage, not a forecast. How hazard risk is graded.