FEMA flood zones · Montana

Park County, Montana Flood Zone Map

141 flood insurance claims·$3.3M paid·5 federal flood & hurricane disasters

2% of Park 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 Park County, Montana. 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

Less than 1% of Park County’s flood insurance claims were on properties rated outside FEMA’s high-risk zones.

120 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 6 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 64 claims and $585,672 paid, the year of Severe Storms,ice Jams, Snow Melt, Flooding.

1978: 1 claims1979: 1 claims1981: 2 claims1982: 1 claims1991: 3 claims1992: 1 claims1995: 1 claims1996: 17 claims1997: 64 claims2011: 13 claims2015: 1 claims2018: 1 claims2020: 1 claims2022: 34 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 Park County describe what happened, in the words of the forecasters who covered it. Read the Montana flood stories →

Federal disasters

13 federal disaster declarations since 1996, 5 of them floods, coastal storms or hurricanes.

DisasterBegan
FloodingApr 10, 2023
Severe Storm And FloodingJun 10, 2022
FloodingMar 20, 2019
FloodingMay 1, 2018
Ice Jams And FloodingMar 1, 2014
Severe Storms And FloodingApr 4, 2011
Hurricane Katrina EvacuationAug 29, 2005
Mt - South Central Zone 4 Fire ComplexAug 16, 2000

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

Recorded flood events

7 since 1996: 1 flash floods and 6 river or area floods.

EventDateDamage
FloodMar 25, 2019—
FloodMay 27, 2014—
FloodMar 5, 2014—
FloodMay 24, 2011$130,000
FloodJun 12, 2011—
FloodMay 10, 2011—
Flash FloodJul 12, 2001—

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

From the storm reports

Flood · Mar 25, 2019. Flooding occurred across many areas of south central and southeast Montana during the latter portions of the month. A considerable snow cover existed through the month. Surface and sub-surface ground temperatures remained frozen through the last week of March. Warming temperatures resulted in this snow to quickly melt. Widespread flooding occurred due to the snow melt not being able to soak into the ground. In ad…

Flood · May 27, 2014. The snowpack during most of the month of May was around 150% of average. There was significant melting of the snowpack below 8000 feet during the month. The melting snowpack resulted in rising river levels and river flooding. The main impacts of the high river flows were fast flows, low-land flooding and bank erosion.

Flood · Mar 5, 2014. After a very cold winter resulting in area rivers, streams and creeks freezing, early March began with some heavy snow followed by a rapid warm-up. This warm-up resulted in snowmelt and ice-jam flooding over area rivers, creeks and streams that continued into the middle of the month. While many areas experienced flooding, the locations that were most impacted by flooding included Park County, areas along the Musse…

Flood · May 24, 2011. A Pacific low moved into the four corners region on the 17th and migrated northeast into the Dakotas through the 22nd, bringing another round of heavy precipitation aided by a tap of Gulf of Mexico moisture. Another system passed to the south on the 23rd and 24th, continuing the precipitation across the area. A new all-time daily precipitation record for Billings was set on May 24th. These two systems brought a to…

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 Park County

If a building in Park 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.