FEMA flood zones · Colorado

San Miguel County, Colorado Flood Zone Map

18 flood insurance claims·$132,604 paid·4 federal flood & hurricane disasters

Less than 1% of San Miguel 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 San Miguel 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 San Miguel County floods

Flash flooding from summer thunderstorms dominates the flood profile of San Miguel County, accounting for 28 out of 35 recorded flood events over the last 30 years, alongside 7 general flood events.

Severe weather patterns drive these occurrences. In August 2023, remnants from Tropical Storm Harold combined with subtropical moisture to produce slow-moving storms, heavy rain, flooding, and debris flows across the region. Earlier in May 2023, above-normal temperatures accelerated a near-record snowpack, causing high, fast flows on regional drainages that compromised low-lying roads and areas.

National Flood Insurance Program records indicate that property owners in high-risk Zone A should pay the most attention, having accumulated 9 claims with an average payout of $18,657 and an average recorded water depth of 8 inches. Additionally, properties in Zone X recorded 6 claims with an average payout of $7,016 and an average water depth of 6 inches, while Zone X shaded recorded 2 claims averaging $18,269 with an average water depth of 1 inch.

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 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 2007, with 6 claims and $89,368 paid.

1983: 1 claims1994: 1 claims1996: 2 claims1997: 1 claims1999: 1 claims2001: 3 claims2007: 6 claims2008: 1 claims2016: 2 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

7 NOAA storm reports from San Miguel 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 1970, 4 of them floods, coastal storms or hurricanes.

DisasterBegan
Hurricane Katrina EvacuationAug 29, 2005
Co - Burn Canyon Fire - 07/15/02Jul 14, 2002
WildfiresApr 23, 2002
Severe Storms, Mudslides, Landslides & FloodingJul 27, 1984
DroughtJan 29, 1977
Flooding & LandslidesJul 6, 1973
Heavy Rains & FloodingSep 22, 1970

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

Recorded flood events

35 since 1996: 28 flash floods and 7 river or area floods.

EventDateDamage
FloodAug 24, 2023$2,000
FloodMay 15, 2023—
Flash FloodJul 31, 2021—
Flash FloodJul 26, 2019—
Flash FloodJul 20, 2016$5,000
Flash FloodJul 28, 2014—
Flash FloodAug 26, 2013—
Flash FloodJul 15, 2013—

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

From the storm reports

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.

Flood · May 15, 2023. Accelerated snowmelt from a near-record snowpack due to above normal temperatures produced high and fast flow on drainages in several counties across the Western Slope. As a result, flooding compromised various low-lying roads and areas. This included some lanes along I-70 west of Fruita, Colorado.

Flash Flood · Jul 31, 2021. High pressure retrograted in response to a deepening mid-level trough over the center of the nation and parked over western Colorado. Even so, subtropical moisture remained entrenched over the area with precipitable water values exceeding an inch and trending over 150% of the climatological norm. As a result, widespread showers and thunderstorms erupted over western Colorado. Additionally, convergence along the Co…

Flash Flood · Jul 26, 2019. Strong instability and adequate subtropical moisture from the North American Monsoon led to training thunderstorms which developed across western Colorado. Some storms produced heavy rain which led to localized flooding and debris flows across some southwest and west-central 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 San Miguel County

If a building in San Miguel 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.