FEMA flood zones · Colorado

Douglas County, Colorado Flood Zone Map

70 flood insurance claims·$661,330 paid·4 federal flood & hurricane disasters

3% of Douglas 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 Douglas 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 Douglas County floods

Flash flooding from summer thunderstorms dominates the flood profile of Douglas County, accounting for 41 out of 46 recorded flood events over the last 30 years. Slow-moving storms frequently drop heavy rainfall across the area, as occurred during a slow-moving storm system in May 2023 that produced heavy rainfall across the urban corridor and Palmer Divide, and during severe storms in June 2024 that brought heavy rainfall and hail to the east and southeast parts of the Denver Metro area.

National Flood Insurance Program claims data indicates that risk extends beyond traditionally mapped high-risk areas. The highest number of claims occurred in Zone X with 50 claims averaging a recorded water depth of 28 inches and an average payout of $9,967, followed by Zone D with 9 claims averaging 9 inches of recorded water depth and an average payout of $42,255. Zone A recorded 6 claims with an average water depth of 22 inches and an average payout of $7,296.

Homeowners, real estate agents, and journalists should pay the closest attention to properties located in Zone X and Zone D, which account for the majority of historical flood insurance claims in the county.

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 18 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 2015, with 11 claims and $7,145 paid.

1979: 1 claims1983: 6 claims1992: 1 claims1996: 1 claims1998: 1 claims1999: 1 claims2006: 2 claims2007: 2 claims2009: 8 claims2011: 2 claims2012: 8 claims2013: 5 claims2014: 1 claims2015: 11 claims2016: 4 claims2018: 4 claims2019: 1 claims2021: 1 claims2023: 9 claims2025: 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

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

Federal disasters

13 federal disaster declarations since 1965, 4 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Storms, Flooding, And TornadoesJun 8, 2023
SnowDec 18, 2006
Hurricane Katrina EvacuationAug 29, 2005
Co - Cherokee Ranch Wildfire - 10/29/2003Oct 29, 2003
SnowMar 17, 2003
Co - Schoonover Fire - 05/23/02May 21, 2002
WildfiresApr 23, 2002
DroughtJan 29, 1977

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

Recorded flood events

46 since 1996: 41 flash floods and 5 river or area floods.

EventDateDamage
Flash FloodJun 9, 2024$20,000
FloodMay 12, 2023$25,000
FloodJun 14, 2015$15,000
FloodJun 12, 2015$15,000
Flash FloodJun 11, 2015$15,000
Flash FloodJul 12, 2014$15,000
Flash FloodAug 22, 2013$50,000
Flash FloodSep 14, 2013—

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

From the storm reports

Flash Flood · Jun 9, 2024. Slow moving thunderstorms produced hail and heavy rainfall as they slowly drift south across the east/southeast part of the Denver Metro area. Additional storms track across Colorado producing hail up to 1 inch in Fairplay and Platteville. Plowable hail occurred under the Fairplay storm.

Flood · May 12, 2023. A slow moving storm system produced flooding and flash flooding across the urban corridor and northeast plains, with heavy snowfall in the higher mountains of the Front Range. Storm total rainfall during the 3-day event ranged from 4 to 7 inches across the urban corridor and Palmer Divide, with 2 to 5 inches across the plains. Additionally, from 1 to 2 feet of heavy wet snow occurred above 10 thousand feet. The…

Flood · Jun 14, 2015. Severe thunderstorms produced large hail up to golfball size. The combination of heavy rain and snowmelt also produced a prolonged period of flooding over southern Jefferson and southwestern Douglas County.

Flood · Jun 12, 2015. Thunderstorms producing heavy rainfall caused flooding and flash flooding across parts of the Urban Corridor and adjacent plains.

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 Douglas County

If a building in Douglas 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.