FEMA flood zones · California

Del Norte County, California Flood Zone Map

37 flood insurance claims·$454,598 paid·9 federal flood & hurricane disasters

3% of Del Norte County’s area is in FEMA’s high-risk flood zones.

Share of the whole county outline, rivers and lakes included; parts FEMA hasn’t mapped count as zero.

Coastal high risk (V, VE)FloodwayHigh risk (A, AE)Moderate (X, 500-year)Minimal (X)Undetermined (D)

Shaded areas are FEMA’s mapped flood hazard zones in and around Del Norte County, California. Zoomed out they are simplified; at street level the map switches to FEMA’s exact layer. Tap anywhere to check that spot, or search an address above.

Where the flood claims came from

16% of Del Norte County’s flood insurance claims were on properties rated outside FEMA’s high-risk zones.

32 NFIP claims with a recorded rated flood zone, 1978 to date. The zone is the one FEMA used to rate that policy, which may not match today’s map. Source: OpenFEMA NFIP claims.

How deep the water got

outlet80″ door12″24″36″48″60″72″84″

In flood insurance claims here that reported a flood depth, the average was 5 inches.

Drawn to scale against an 80-inch door. Even a few inches soaks flooring, the bottom of the drywall and anything plugged in near the floor.

Average of the depths reported on claims (zero and implausible values left out); FEMA’s record doesn’t say exactly where each depth was measured. Source: OpenFEMA NFIP claims.

Flood claims, year by year

The worst year was 1997, with 7 claims and $254,754 paid.

1981: 1 claims1984: 1 claims1986: 4 claims1993: 3 claims1995: 4 claims1996: 4 claims1997: 7 claims2005: 2 claims2006: 2 claims2011: 1 claims2012: 2 claims2013: 1 claims2015: 1 claims2016: 1 claims2017: 1 claims2019: 1 claims2023: 1 claims19801990200020102020

Bar height is scaled by square root so ordinary years stay visible next to the worst one. NFIP claims by year of loss. Source: OpenFEMA.

In their words

2 NOAA storm reports from Del Norte County describe what happened, in the words of the forecasters who covered it. Read the California flood stories →

Federal disasters

21 federal disaster declarations since 1964, 9 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Winter Storms, Flooding, Landslides, And MudslidesMar 9, 2023
Severe Winter Storms, Straight-line Winds, Flooding, Landslides, And MudslidesFeb 21, 2023
Severe Winter Storms, Flooding, Landslides, And MudslidesDec 27, 2022
WildfiresSep 4, 2020
Severe Winter Storms, Flooding, Landslides, And MudslidesFeb 24, 2019
Severe Winter Storms, Flooding, And MudslidesFeb 1, 2017
Tsunami WavesMar 11, 2011
Severe Storms, Flooding, Mudslides, And LandslidesDec 17, 2005

Weather and water disasters only; most recent first. Source: OpenFEMA Disaster Declarations.

Recorded flood events

13 since 1996: 2 flash floods, 9 river or area floods and 2 coastal floods or surges.

EventDateDamage
FloodJan 13, 2024—
Coastal FloodJan 5, 2023—
FloodJan 16, 2019—
FloodMar 22, 2018—
Flash FloodApr 6, 2018—
Flash FloodOct 16, 2016—
FloodDec 14, 2016$583,700
FloodDec 28, 2008$7,000

— = no damage estimate in the record. Source: NOAA Storm Events Database.

From the storm reports

Flood · Jan 13, 2024. An atmospheric river sank south and stalled over Humboldt, Del Norte, and western Trinity counties, bringing widespread rains between 3 and 7 inches to the region. Rain fell over a short period of time, 8-10 hours, resulting in the highest flows on the Mad River and Redwood Creek since the 1970s. Widespread creek flooding occurred in Del Norte and Humboldt counties with multiple homes damages or destroyed.

Coastal Flood · Jan 5, 2023. A quasi-stationary westerly upper flow regime yielded multiple atmospheric rivers over Northwest California during the first two weeks of January. Impacts from these events were widespread, both in terms of flooding and wind damage.

Flood · Jan 16, 2019. An atmospheric river spread across northern California and produced heavy rain that led to localized flooding.

Flood · Mar 22, 2018. A late season atmospheric river impacted northwest California during late March. Localized flooding, rock slides, and high elevation snowfall were observed.

National Weather Service narratives, lightly trimmed. Source: NOAA Storm Events Database.

The zones you’ll see on the map

Every colour on the map above is a place on this drawing: where the ground sits relative to the flood FEMA plans for.

Cross-section of a river floodplainDiagram: a river valley. The floodway is the channel and the land beside it; the 1%-annual-chance flood surface (the base flood elevation) covers the valley floor as zone A or AE; a narrow band higher up is shaded X, the 0.2% floodplain; higher ground is X.0.2% CHANCE A YEAR (500-YEAR)BASE FLOOD ELEVATION · 1% A YEARXAEFloodwayAEX
  1. A / AE Inside the 1%-a-year floodplain: about a 26% chance of flooding over a 30-year mortgage. AE has a mapped base flood elevation; plain A does not.
  2. Floodway The channel and the land beside it that has to be kept clear enough to carry the flood. Building here is tightly limited.
  3. X shaded The 0.2% (500-year) floodplain, plus some levee-protected and very shallow flood areas.
  4. X Outside both lines. No federal requirement to insure, which is not the same as no risk.

Every flood zone code explained →

Flood insurance in Del Norte County

If a building in Del Norte County is in a high-risk zone (A or V) and its mortgage comes from a federally regulated or insured lender, or is federally backed, flood insurance is required.

Outside those zones it is optional, and often worth having: from 2014 to 2024 nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area. Since Risk Rating 2.0, NFIP premiums are set for each building, so the only reliable price is a quote: FloodSmart.gov or a local agent.