FEMA flood zones · Colorado

Gunnison County, Colorado Flood Zone Map

40 flood insurance claims·$86,884 paid·3 federal flood & hurricane disasters

1% of Gunnison 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 Gunnison County, Colorado. 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 Gunnison County floods

Long-term data from the NOAA Storm Events Database shows that general riverine flooding dominates the flood risk profile in Gunnison County, accounting for 13 events and 2 deaths over the last 30 years, alongside 7 flash flood events. Recent events illustrate these varied drivers: in May 2023, warm temperatures and a near-record snowpack accelerated snowmelt, causing excessive runoff that flooded a ranch along the East River and compromised a culvert near Bear Creek. Later that year in August 2023, remnants from Tropical Storm Harold combined with subtropical moisture to produce slow-moving thunderstorms, heavy rain, debris flows, and widespread flooding.

FEMA National Flood Insurance Program records indicate historical claims across multiple zones. Zone UNKNOWN recorded 18 claims with an average payout of $2,782 and an average recorded water depth of 1 inch. Zone A recorded 12 claims with an average payout of $4,083 and an average recorded water depth of 1 inch. Zone X recorded 10 claims with an average payout of $3,256 and an average recorded water depth of 6 inches.

Property owners located near rivers, streams, and drainage paths, as well as those in unmapped or Zone X areas, should pay the closest attention to flood risk given the documented impacts of seasonal snowmelt and heavy summer rainfall.

Summary written from NOAA storm reports and NFIP claims for this county. Not a prediction.

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 1984, with 11 claims and $15,864 paid, the year of Severe Storms, Mudslides, Landslides & Flooding.

1979: 1 claims1980: 3 claims1984: 11 claims1985: 3 claims1993: 2 claims1995: 4 claims1997: 1 claims2000: 1 claims2005: 1 claims2008: 8 claims2009: 1 claims2010: 2 claims2011: 1 claims2019: 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

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

Federal disasters

9 federal disaster declarations since 1973, 3 of them floods, coastal storms or hurricanes.

DisasterBegan
Hurricane Katrina EvacuationAug 29, 2005
SnowMar 17, 2003
Wiley Ridge Fire-06/23/02Jun 23, 2002
WildfiresApr 23, 2002
Severe Storms, Mudslides, Landslides & FloodingJul 27, 1984
DroughtJan 29, 1977
Flooding & LandslidesJul 6, 1973

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

Recorded flood events

20 since 1996: 7 flash floods and 13 river or area floods.

EventDateDamage
FloodMay 31, 2023$10,000
FloodApr 30, 2023$500,000
FloodMay 24, 2023$25,000
FloodMay 24, 2023$10,000
FloodAug 24, 2023$5,000
FloodMay 5, 2023$1,000
FloodJun 21, 2019— · 1 killed
Flash FloodJun 11, 2015—

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

From the storm reports

Flood · May 31, 2023. Continued very warm temperatures on an above normal snowpack resulted in excessive runoff leading to flooding across portions of west-central Colorado, particularly Gunnison County. Conditions were only exacerbated by heavy rain from thunderstorms in the days prior.

Flood · Apr 30, 2023. Accelerated snowmelt from a near-record snowpack due to above normal temperatures produced high and fast flow on drainages in Gunnison County. As a result, flooding compromised and led to the failure of a culvert which led to flooding near Bear Creek.

Flood · May 24, 2023. Accelerated snowmelt from a near-record snowpack due to above normal temperatures and precipitation produced high and fast flow on drainages in several west-central counties. As a result, flooding compromised various low-lying roads in the counties.

Flood · Aug 24, 2023. Remnants from Tropical Storm Harold lifted across the Desert Southwest. This, combined with already abundant subtropical moisture, resulted in widespread showers and thunderstorms across western Colorado. Storms were slow moving and produced heavy rain. As a result of the heavy rain, some flooding and debris flows occurred in portions of Gunnison, Garfield, Mesa, and Montezuma counties.

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 Gunnison County

If a building in Gunnison 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.