FEMA flood zones · Oregon

Grant County, Oregon Flood Zone Map

12 flood insurance claims·$52,564 paid·3 federal flood & hurricane disasters

Less than 1% of Grant 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 Grant County, Oregon. 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.

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 7 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 3 claims and $38,096 paid.

1978: 1 claims1979: 1 claims1983: 1 claims1991: 2 claims1997: 3 claims2010: 3 claims2011: 1 claims1980199020002010

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

1 NOAA storm reports from Grant County describe what happened, in the words of the forecasters who covered it. Read the Oregon flood stories →

Federal disasters

15 federal disaster declarations since 1964, 3 of them floods, coastal storms or hurricanes.

DisasterBegan
Rail Ridge FireSep 2, 2024
Battle Mountain Fire ComplexJul 21, 2024
Boneyard FireJul 20, 2024
Falls FireJul 18, 2024
WildfiresJul 10, 2024
Severe Storms, Flooding, Landslides, And MudslidesApr 6, 2019
Canyon Creek Fire ComplexAug 14, 2015
Hurricane Katrina EvacuationAug 29, 2005

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

Recorded flood events

13 since 1996: 5 flash floods and 8 river or area floods.

EventDateDamage
FloodJan 3, 2025—
FloodMay 20, 2020—
FloodApr 8, 2019$1.4M
Flash FloodMay 25, 2018—
FloodMar 10, 2014—
Flash FloodAug 22, 2013—
FloodJan 16, 2011—
FloodMay 15, 2011—

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

From the storm reports

Flood · Jan 3, 2025. Increased runoff and some snowmelt from the higher elevations around the southern John Day Basin resulted in rising river levels on the John Day river between John Day and Prairie City.

Flood · May 20, 2020. Heavy rain with QPF amounts of 2-4 inches across the Blue Mountains, Blue Mountain Foothills, and John Day Highlands produced areal and river flooding on May 20th and ending on May 21st. Most of the flooding was minor.

Flood · Apr 8, 2019. Snow water equivalents near 200% of normal in the Blue Mountains coupled with warm temperatures and near record rainfall totals for April produced significant river flooding across eastern Oregon.

Flash Flood · May 25, 2018. Persistent moist southwest flow continued into the 25th of May. Thunderstorms developed late morning and continued well into the evening. The storms produced locally heavy rain and some flooding. Also some hail occurred with the storms. The hail was mainly small, but did reach to 1 inch in diameter.

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 Grant County

If a building in Grant 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.