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Chattahoochee River below Morgan Falls Dam near Roswell

Highest listed crest 827.01 ftFlood stage 821.0 ft6 crests since 2003

The Chattahoochee River below Morgan Falls Dam near Roswell crested at major flood stage 1 time among the 6 crests the National Weather Service lists from 2003 to 2013. The highest, 827.01 ft on September 22, 2009, was major flooding, 6.01 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
827.01 ft
September 22, 2009; 35,500 cubic feet per second
Flood stage
821.0 ft
Major flooding from 826.0 ft
Crests at major
1
68th of 271 gauges in Georgia
Most recent flood crest
September 22, 2009
827.01 ft, major flooding
Location
Fulton County
Near Sandy Springs (2.7 mi), Dunwoody (4.4 mi), Roswell (5.2 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 below Morgan Falls Dam near Roswell
Action stage819.04May 19, 2013The level at which the NWS or its partners begin to take action
Flood stage (minor)821.00—Minimal or no property damage, but possibly some public threat
Moderate flood stage823.01Sep 17, 2004Some inundation of structures and roads near the stream
Major flood stage826.01Sep 22, 2009Extensive inundation of structures and roads

Every listed crest

6 crests from 2003 to 2013. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Chattahoochee River below Morgan Falls Dam near Roswell, 2003 to 2013 818820822824826828ft Flood stage 821.0 ftMajor 826.0 ft Mar 6, 2003: 820.93 ft, action stage; 15,900 cubic feet per secondSep 17, 2004: 824.71 ft, moderate flooding; 20,900 cubic feet per secondJul 16, 2005: 819.28 ft, action stage; 10,800 cubic feet per secondSep 22, 2009: 827.01 ft, major flooding; 35,500 cubic feet per secondOct 12, 2009: 820.56 ft, action stage; 13,600 cubic feet per secondMay 19, 2013: 819.12 ft, action stage; 12,200 cubic feet per second Highest, 827.01 ft, Sep 22, 2009 20052010

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Chattahoochee River below Morgan Falls Dam near Roswell 2000s: 2 2 2010s: 0 2000s2010s
  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 below Morgan Falls Dam near Roswell
1Sep 22, 2009827.01+6.01Major35,500
2Sep 17, 2004824.71+3.71Moderate20,900
3Mar 6, 2003820.93−0.07Action15,900
4Oct 12, 2009820.56−0.44Action13,600
5Jul 16, 2005819.28−1.72Action10,800
6May 19, 2013819.12−1.88Action12,200

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 22, 2009: 827.01 ft here, major flooding

September 17, 2004: 824.71 ft here, moderate flooding

  • AtlantaGA · Sep 17, 2004 · 22.60 ft · Major
  • GA 280 near AtlantaGA · Sep 17, 2004 · 30.29 ft · Moderate
  • WhitesburgGA · Sep 18, 2004 · 19.38 ft · Minor
  • RoswellGA · Sep 17, 2004 · 9.94 ft · Minor
  • HelenGA · Sep 17, 2004 · 6.75 ft · Minor

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
RoswellGA9.011.96 ft, Sep 21, 20090
Morgan Falls Dam near Roswell this gaugeGA821.0827.01 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
Roswell9.011.96 ft, Sep 21, 20090
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
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 MGFG1, 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.