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South River at Flakes Mill Road near Snapfinger

Highest listed crest 21.42 ftFlood stage 13.0 ft20 crests since 1956

The South River at Flakes Mill Road near Snapfinger crested above flood stage 20 times among the 20 crests the National Weather Service lists from 1956 to 2024. The highest, 21.42 ft on September 27, 2024, was moderate flooding, 8.42 feet above flood stage. 4 other gauges on the South River crested above flood stage within a week of it, 3 at their own highest listed crest.

The gauge

Highest listed crest
21.42 ft
September 27, 2024; 13,072 cubic feet per second
Flood stage
13.0 ft
Major flooding from 25.0 ft
Crests at major
0
20 above flood stage
Most recent flood crest
September 27, 2024
21.42 ft, moderate flooding
Location
DeKalb County
Near Stonecrest (4.7 mi), Forest Park (8.3 mi), Decatur (8.3 mi)

Flood stages

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

Flood categories, South River at Flakes Mill Road near Snapfinger
Action stage11.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)13.017Mar 6, 2024Minimal or no property damage, but possibly some public threat
Moderate flood stage19.03Sep 27, 2024Some inundation of structures and roads near the stream
Major flood stage25.00—Extensive inundation of structures and roads

Every listed crest

20 crests from 1956 to 2024. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the South River at Flakes Mill Road near Snapfinger, 1956 to 2024 1015202530ft Flood stage 13.0 ftMajor 25.0 ft Mar 16, 1956: 13.71 ft, minor flooding; 6,930 cubic feet per secondFeb 25, 1961: 21.30 ft, moderate flooding; 12,500 cubic feet per secondApr 30, 1963: 14.34 ft, minor flooding; 6,810 cubic feet per secondApr 6, 1964: 15.58 ft, minor flooding; 7,720 cubic feet per secondFeb 13, 1966: 14.87 ft, minor flooding; 7,200 cubic feet per secondApr 18, 1969: 13.55 ft, minor flooding; 6,320 cubic feet per secondFeb 1, 1973: 13.89 ft, minor flooding; 6,520 cubic feet per secondDec 31, 1973: 13.17 ft, minor flooding; 6,020 cubic feet per secondMar 16, 1976: 19.89 ft, moderate flooding; 11,000 cubic feet per secondApr 13, 1979: 17.17 ft, minor flooding; 8,820 cubic feet per secondMar 8, 1980: 14.41 ft, minor flooding; 6,700 cubic feet per secondMar 6, 1983: 14.72 ft, minor flooding; 7,020 cubic feet per secondMar 17, 1990: 18.25 ft, minor flooding; 9,400 cubic feet per secondDec 25, 2015: 18.23 ft, minor flooding; 9,384 cubic feet per secondApr 6, 2017: 13.06 ft, minor flooding; 6,035 cubic feet per secondDec 29, 2018: 13.63 ft, minor flooding; 6,372 cubic feet per secondApr 19, 2019: 16.35 ft, minor flooding; 8,010 cubic feet per secondOct 11, 2020: 16.63 ft, minor flooding; 8,178 cubic feet per secondMar 6, 2024: 15.92 ft, minor flooding; 7,751 cubic feet per secondSep 27, 2024: 21.42 ft, moderate flooding; 13,072 cubic feet per second Highest, 21.42 ft, Sep 27, 2024 1960197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, South River at Flakes Mill Road near Snapfinger 1950s: 1 1960s: 5 5 1970s: 4 1980s: 2 1990s: 1 2000s: 0 2010s: 4 2020s: 3 1950s1960s1970s1980s1990s2000s2010s2020s
  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, South River at Flakes Mill Road near Snapfinger
1Sep 27, 202421.42+8.42Moderate13,072
2Feb 25, 196121.30+8.30Moderate12,500
3Mar 16, 197619.89+6.89Moderate11,000
4Mar 17, 199018.25+5.25Minor9,400
5Dec 25, 201518.23+5.23Minor9,384
6Apr 13, 197917.17+4.17Minor8,820
7Oct 11, 202016.63+3.63Minor8,178
8Apr 19, 201916.35+3.35Minor8,010
9Mar 6, 202415.92+2.92Minor7,751
10Apr 6, 196415.58+2.58Minor7,720
11Feb 13, 196614.87+1.87Minor7,200
12Mar 6, 198314.72+1.72Minor7,020
13Mar 8, 198014.41+1.41Minor6,700
14Apr 30, 196314.34+1.34Minor6,810
15Feb 1, 197313.89+0.89Minor6,520
16Mar 16, 195613.71+0.71Minor6,930
17Dec 29, 201813.63+0.63Minor6,372
18Apr 18, 196913.55+0.55Minor6,320
19Dec 31, 197313.17+0.17Minor6,020
20Apr 6, 201713.06+0.06Minor6,035

The worst floods along the South River

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

September 27, 2024: 21.42 ft here, moderate flooding

February 25, 1961: 21.30 ft here, moderate flooding

March 17, 1990: 18.25 ft here, minor flooding

Gauges on the South River

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

Flood gauges on the South River
Forrest Park Road at AtlantaGA15.016.62 ft, Sep 19, 20090
Bouldercrest Road at AtlantaGA15.016.01 ft, Sep 27, 20240
Flakes Mill Road near Snapfinger this gaugeGA13.021.42 ft, Sep 27, 20240
Klondike Road near LithoniaGA12.015.42 ft, Sep 27, 20240
GA 81 at Snapping ShoalsGA12.016.41 ft, Sep 28, 20240

Other gauges in DeKalb County

Flood gauges in DeKalb County
Montreal Road near Tucker8.08.64 ft, Oct 11, 20200
Rainbow Drive near Decatur11.013.32 ft, Oct 11, 20200
Constitution Road near Atlanta11.014.23 ft, Sep 16, 20040
Johnson Ferry Road near Chamblee16.022.50 ft, Sep 21, 20090
Briarwood Road near Atlanta10.015.81 ft, Sep 27, 20240
Buford Highway at Atlanta13.018.57 ft, Sep 21, 20094
Evans Mill Road near Lithonia8.08.25 ft, Apr 19, 20190
Columbia Drive near Atlanta11.013.42 ft, Dec 24, 20150
Redan Road near Glen Haven12.018.00 ft, Sep 21, 20090
Thompson Mill Road near Lithonia16.017.54 ft, Oct 11, 20200
Casa Drive at Clarkston10.010.25 ft, Sep 27, 20240
Johnson Road near Atlanta13.016.53 ft, Sep 27, 20240
Bouldercrest Road at Atlanta15.016.01 ft, Sep 27, 20240
Silver Hill Road near Stone Mountain9.09.94 ft, Oct 11, 20200
GA 124 near Lithonia15.027.47 ft, Sep 21, 20091
Pleasant Hill Road near Lithonia13.025.54 ft, Sep 22, 20091

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

NOAA National Water Prediction Service, gauge SFMG1, 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.