FEMA flood zones · Oregon

Union County, Oregon Flood Zone Map

21 flood insurance claims·$165,391 paid·4 federal flood & hurricane disasters

Less than 1% of Union 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 Union 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 2 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 2020, with 3 claims and $45,430 paid, the year of Severe Storms, Flooding, Landslides, and Mudslides.

1978: 1 claims1979: 1 claims1982: 1 claims1984: 1 claims1986: 1 claims1991: 2 claims1996: 2 claims1998: 2 claims2008: 1 claims2010: 1 claims2011: 2 claims2019: 2 claims2020: 3 claims2021: 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

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

Federal disasters

8 federal disaster declarations since 1964, 4 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Storms, Flooding, Landslides, And MudslidesFeb 5, 2020
Hurricane Katrina EvacuationAug 29, 2005
Severe Winter StormsDec 26, 2003
High Winds, Severe Storms And FloodingFeb 4, 1996
DroughtApr 29, 1977
Heavy Rains & FloodingDec 24, 1964

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

Recorded flood events

12 since 1996: 3 flash floods and 9 river or area floods.

EventDateDamage
FloodMay 20, 2020—
FloodFeb 6, 2020$750,000
FloodApr 8, 2019$250,000
FloodMar 9, 2014—
FloodMay 15, 2011$2.0M
FloodJun 2, 2010—
FloodMay 18, 2008$30,000
FloodMay 6, 2005—

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

From the storm reports

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 · Feb 6, 2020. Summary : Heavy snow on February 4-5, 2020 was followed by a period of heavy rain, February 5-7. Snow levels rose to near 5000 feet. The heavy rain and snow melt lead to moderate flooding and several landslides along the East Slopes of the Washington Cascades. There was record flooding on several rivers, including the Umatilla, Walla Walla and Touchet rivers with widespread flooding of numerous other creeks and…

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.

Flood · Mar 9, 2014. Heavy rain fell across much of the northern Blue Mountains and Wallowa County throughout the first week of March. March 9th received very heavy rain with snow levels around 6000ft. This allowed for a significant increase in runoff, which lead to a quick rise in rivers for the period. Flooding was reported at the confluence of Five Points Creek and the Grande Ronde River near Hilgard. Field flooding occurred alo…

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 Union County

If a building in Union 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.