FEMA flood zones · North Dakota

Pierce County, North Dakota Flood Zone Map

10 flood insurance claims·$55,786 paid·11 federal flood & hurricane disasters

Less than 1% of Pierce 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 Pierce County, North Dakota. 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 1999, with 6 claims and $45,786 paid, the year of Severe Storms, Flooding, Snow, Ice, Ground Saturation, Lanslides, Mudslides, and Tor.

1996: 1 claims1997: 3 claims1999: 6 claims198019902000

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 Pierce County describe what happened, in the words of the forecasters who covered it. Read the North Dakota flood stories →

Federal disasters

23 federal disaster declarations since 1969, 11 of them floods, coastal storms or hurricanes.

DisasterBegan
FloodingMar 23, 2017
Severe Storms And FloodingJun 25, 2014
Severe Storms And FloodingMay 17, 2013
FloodingFeb 14, 2011
Severe Storms And FloodingMar 13, 2009
Severe Winter Storm And Record And/or Near Record SnowOct 4, 2005
Hurricane Katrina EvacuationAug 29, 2005
Severe Storms, Flooding, And Ground SaturationJun 1, 2005

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

Recorded flood events

5 since 1996: 2 flash floods and 3 river or area floods.

EventDateDamage
Flash FloodSep 16, 2024$35,000
FloodMar 6, 2009$25,000
FloodApr 1, 2009$271,000
Flash FloodJun 29, 2005—
FloodAug 12, 1999—

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

From the storm reports

Flash Flood · Sep 16, 2024. Thunderstorms formed to the north of a surface frontal zone in an area of elevated instability. Some storms became severe, producing large hail. The largest hail was the size of a tennis ball, which fell to the southwest of Voltaire in McHenry County. In addition to the hail, torrential rain fell with these storms. This led to flash flooding in Pierce County to the south and southeast of Balta and north of Highway…

Flood · Mar 6, 2009. This devastating flooding continued into April, and in some cases worsened.||Western and central North Dakota experienced a snowy winter of 2008-2009. Bismarck, for example, had the snowiest December on record, which was also the snowiest month ever on record, with 33.3 inches of snow in December 2008. March 2009 was the fifth snowiest month on record with 29.7 inches. For the entire season Bismarck ended up the s…

Flood · Apr 1, 2009. Western and central North Dakota experienced a snowy winter of 2008-2009. Bismarck, for example, had the snowiest December on record, which was also the snowiest month ever on record, with 33.3 inches of snow in December 2008. March 2009 was the fifth snowiest month on record with 29.7 inches. For the entire season Bismarck ended up the second snowiest on record with 100.3 inches. A similar scenario played out all…

Flood · Aug 12, 1999. Heavy rainfall of 3 to 6 inches were common throughout the three county area. Main flood problems wereflooded streets and underpasses in urban areas. In open country ditches filled rapidly overrunning countyroads.

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 Pierce County

If a building in Pierce 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.