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Chattahoochee River above Roswell

Highest listed crest 11.96 ftFlood stage 9.0 ft25 crests since 1977

The Chattahoochee River above Roswell crested above flood stage 18 times among the 25 crests the National Weather Service lists from 1977 to 2024. The highest, 11.96 ft on September 21, 2009, was minor flooding, 2.96 feet above flood stage. 10 other gauges on the Chattahoochee River crested above flood stage within a week of it, 5 at their own highest listed crest.

The gauge

Highest listed crest
11.96 ft
September 21, 2009; 21,100 cubic feet per second
Flood stage
9.0 ft
Major flooding from 17.0 ft
Crests at major
0
18 above flood stage
Most recent flood crest
September 27, 2024
10.37 ft, minor flooding
Location
Fulton County
Near Dunwoody (3.1 mi), Roswell (4.2 mi), Sandy Springs (4.8 mi)

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Chattahoochee River above Roswell
Action stage8.07Aug 21, 1992The level at which the NWS or its partners begin to take action
Flood stage (minor)9.018Sep 27, 2024Minimal or no property damage, but possibly some public threat
Moderate flood stage13.00—Some inundation of structures and roads near the stream
Major flood stage17.00—Extensive inundation of structures and roads

Every listed crest

25 crests from 1977 to 2024. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Chattahoochee River above Roswell, 1977 to 2024 81012141618ft Flood stage 9.0 ftMajor 17.0 ft Mar 30, 1977: 8.90 ft, action stage; 11,800 cubic feet per secondJan 25, 1978: 8.45 ft, action stage; 10,800 cubic feet per secondApr 13, 1979: 9.75 ft, minor flooding; 13,800 cubic feet per secondMar 24, 1980: 8.63 ft, action stage; 10,600 cubic feet per secondFeb 3, 1982: 8.64 ft, action stage; 10,600 cubic feet per secondApr 8, 1983: 8.29 ft, action stage; 9,700 cubic feet per secondDec 6, 1983: 8.98 ft, action stage; 11,500 cubic feet per secondMar 17, 1990: 9.89 ft, minor flooding; 14,500 cubic feet per secondSep 2, 1991: 9.28 ft, minor flooding; 12,700 cubic feet per secondAug 21, 1992: 8.70 ft, action stage; 11,200 cubic feet per secondJan 27, 1996: 9.54 ft, minor flooding; 13,500 cubic feet per secondMay 8, 1998: 9.10 ft, minor flooding; 12,200 cubic feet per secondMar 6, 2003: 9.20 ft, minor flooding; 12,500 cubic feet per secondSep 17, 2004: 9.94 ft, minor flooding; 14,600 cubic feet per secondAug 13, 2005: 9.17 ft, minor flooding; 12,400 cubic feet per secondSep 21, 2009: 11.96 ft, minor flooding; 21,100 cubic feet per secondMay 19, 2013: 9.67 ft, minor flooding; 13,843 cubic feet per secondDec 28, 2018: 9.97 ft, minor flooding; 14,734 cubic feet per secondApr 19, 2019: 9.76 ft, minor flooding; 14,110 cubic feet per secondMar 25, 2020: 9.68 ft, minor flooding; 13,873 cubic feet per secondOct 11, 2020: 11.51 ft, minor flooding; 19,605 cubic feet per secondSep 8, 2021: 9.77 ft, minor flooding; 14,127 cubic feet per secondJan 4, 2023: 9.77 ft, minor flooding; 14,100 cubic feet per secondMar 6, 2024: 9.23 ft, minor flooding; 12,599 cubic feet per secondSep 27, 2024: 10.37 ft, minor flooding; 15,918 cubic feet per second Highest, 11.96 ft, Sep 21, 2009 19801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Chattahoochee River above Roswell 1970s: 1 1980s: 0 1990s: 4 2000s: 4 2010s: 3 2020s: 6 6 1970s1980s1990s2000s2010s2020s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

Highest listed crests, Chattahoochee River above Roswell
1Sep 21, 200911.96+2.96Minor21,100
2Oct 11, 202011.51+2.51Minor19,605
3Sep 27, 202410.37+1.37Minor15,918
4Dec 28, 20189.97+0.97Minor14,734
5Sep 17, 20049.94+0.94Minor14,600
6Mar 17, 19909.89+0.89Minor14,500
7Sep 8, 20219.77+0.77Minor14,127
8Jan 4, 20239.77+0.77Minor14,100
9Apr 19, 20199.76+0.76Minor14,110
10Apr 13, 19799.75+0.75Minor13,800
11Mar 25, 20209.68+0.68Minor13,873
12May 19, 20139.67+0.67Minor13,843
13Jan 27, 19969.54+0.54Minor13,500
14Sep 2, 19919.28+0.28Minor12,700
15Mar 6, 20249.23+0.23Minor12,599
16Mar 6, 20039.20+0.20Minor12,500
17Aug 13, 20059.17+0.17Minor12,400
18May 8, 19989.10+0.10Minor12,200
19Dec 6, 19838.98−0.02Action11,500
20Mar 30, 19778.90−0.10Action11,800
21Aug 21, 19928.70−0.30Action11,200
22Feb 3, 19828.64−0.36Action10,600
23Mar 24, 19808.63−0.37Action10,600
24Jan 25, 19788.45−0.55Action10,800
25Apr 8, 19838.29−0.71Action9,700

The worst floods along the Chattahoochee River

For this gauge's highest crests, the other gauges on the Chattahoochee River that crested above flood stage within a week.

September 21, 2009: 11.96 ft here, minor flooding

October 11, 2020: 11.51 ft here, minor flooding

September 27, 2024: 10.37 ft here, minor flooding

Gauges on the Chattahoochee River

In USGS station-number order, which runs downstream within a river basin.

Flood gauges on the Chattahoochee River
HelenGA6.012.00 ft, Aug 23, 19672
CorneliaGA14.020.63 ft, Oct 11, 20200
Highway 141 near NorcrossGA12.027.70 ft, Jan 8, 194613
Roswell this gaugeGA9.011.96 ft, Sep 21, 20090
Morgan Falls Dam near RoswellGA821.0827.01 ft, Sep 22, 20091
US 41 at AtlantaGA14.028.59 ft, Sep 22, 20095
AtlantaGA14.029.00 ft, Dec 10, 191913
GA 280 near AtlantaGA24.035.98 ft, Sep 22, 20093
FairburnGA20.031.60 ft, Dec 10, 19192
WhitesburgGA17.029.74 ft, Sep 23, 20093
GA 100 at FranklinGA23.030.55 ft, Sep 24, 20091
West PointGA17.029.25 ft, Dec 10, 191914
14th Street at ColumbusAL27.055.20 ft, Mar 15, 19294
W.F. George Lock and DamAL134.0158.50 ft, Mar 17, 19290
George W. Andrews Lock and Dam (USACE)GA106.0128.28 ft, Mar 18, 19291

Other gauges in Fulton County

Flood gauges in Fulton County
Hog Wallow at Roswell10.015.41 ft, Sep 22, 20090
Alpharetta7.013.05 ft, Feb 3, 19821
Atlanta14.029.00 ft, Dec 10, 191913
GA 280 near Atlanta24.035.98 ft, Sep 22, 20093
Highway 141 near Norcross12.027.70 ft, Jan 8, 194613
Morgan Falls Dam near Roswell821.0827.01 ft, Sep 22, 20091
Rickenbacker Drive at Atlanta11.015.50 ft, Dec 1, 19738
West Wesley Road at Atlanta12.025.46 ft, Sep 22, 20093
Atlanta17.025.80 ft, Dec 9, 19199
Jackson Parkway at Atlanta13.018.03 ft, Mar 13, 19750
Atlanta12.015.95 ft, Mar 13, 20190
Forrest Park Road at Atlanta15.016.62 ft, Sep 19, 20090
Great Southwest Parkway near Atlanta18.027.89 ft, Sep 22, 20091
Defoors Ferry Road at Atlanta15.023.61 ft, Sep 22, 20091

Fulton County: every hazard · River floods across the country · Georgia

NOAA National Water Prediction Service, gauge RWLG1, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.