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Big Creek at GA 9 near Cumming

Highest listed crest 10.43 ftFlood stage 6.0 ft105 crests since 2008

The Big Creek at GA 9 near Cumming crested above flood stage 105 times among the 105 crests the National Weather Service lists from 2008 to 2026. The highest, 10.43 ft on September 22, 2009, was minor flooding, 4.43 feet above flood stage. 2 other gauges on the Big Creek crested above flood stage within a week of it, 1 at its own highest listed crest.

The gauge

Highest listed crest
10.43 ft
September 22, 2009; 4,800 cubic feet per second
Flood stage
6.0 ft
Major flooding from 15.0 ft
Crests at major
0
105 above flood stage
Most recent flood crest
February 27, 2026
6.76 ft, minor flooding
Location
Forsyth County
Near Milton (5.5 mi), Cumming (6.0 mi), Alpharetta (6.6 mi)

Flood stages

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

Flood categories, Big Creek at GA 9 near Cumming
Action stage4.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)6.0105Feb 27, 2026Minimal or no property damage, but possibly some public threat
Moderate flood stage12.00—Some inundation of structures and roads near the stream
Major flood stage15.00—Extensive inundation of structures and roads

Every listed crest

105 crests from 2008 to 2026. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Big Creek at GA 9 near Cumming, 2008 to 2026 6810121416ft Flood stage 6.0 ftMajor 15.0 ft Mar 15, 2008: 7.84 ft, minor flooding; 1,270 cubic feet per secondSep 22, 2009: 10.43 ft, minor flooding; 4,800 cubic feet per secondMay 3, 2010: 6.69 ft, minor flooding; 614 cubic feet per secondJul 2, 2010: 6.56 ft, minor flooding; 565 cubic feet per secondJul 12, 2010: 6.62 ft, minor flooding; 587 cubic feet per secondJul 17, 2010: 8.14 ft, minor flooding; 1,527 cubic feet per secondDec 1, 2010: 6.92 ft, minor flooding; 700 cubic feet per secondFeb 2, 2011: 6.58 ft, minor flooding; 572 cubic feet per secondMar 9, 2011: 8.12 ft, minor flooding; 1,500 cubic feet per secondApr 5, 2011: 6.11 ft, minor flooding; 458 cubic feet per secondApr 16, 2011: 7.32 ft, minor flooding; 915 cubic feet per secondMar 3, 2012: 6.99 ft, minor flooding; 726 cubic feet per secondOct 2, 2012: 6.86 ft, minor flooding; 677 cubic feet per secondDec 21, 2012: 6.35 ft, minor flooding; 510 cubic feet per secondDec 26, 2012: 7.20 ft, minor flooding; 845 cubic feet per secondJan 17, 2013: 6.62 ft, minor flooding; 587 cubic feet per secondJan 31, 2013: 7.60 ft, minor flooding; 1,093 cubic feet per secondFeb 11, 2013: 6.20 ft, minor flooding; 478 cubic feet per secondFeb 26, 2013: 6.91 ft, minor flooding; 696 cubic feet per secondMar 12, 2013: 6.34 ft, minor flooding; 508 cubic feet per secondMar 24, 2013: 7.33 ft, minor flooding; 921 cubic feet per secondApr 12, 2013: 6.82 ft, minor flooding; 662 cubic feet per secondApr 29, 2013: 7.02 ft, minor flooding; 741 cubic feet per secondMay 5, 2013: 8.13 ft, minor flooding; 1,517 cubic feet per secondMay 19, 2013: 8.24 ft, minor flooding; 1,625 cubic feet per secondJul 4, 2013: 7.48 ft, minor flooding; 1,008 cubic feet per secondAug 1, 2013: 9.15 ft, minor flooding; 2,693 cubic feet per secondAug 7, 2013: 8.28 ft, minor flooding; 1,664 cubic feet per secondAug 19, 2013: 8.33 ft, minor flooding; 1,713 cubic feet per secondOct 7, 2013: 6.02 ft, minor flooding; 439 cubic feet per secondNov 27, 2013: 6.60 ft, minor flooding; 580 cubic feet per secondDec 9, 2013: 7.27 ft, minor flooding; 886 cubic feet per secondDec 23, 2013: 8.46 ft, minor flooding; 1,840 cubic feet per secondJan 11, 2014: 7.11 ft, minor flooding; 793 cubic feet per secondMar 16, 2014: 6.42 ft, minor flooding; 525 cubic feet per secondApr 7, 2014: 8.76 ft, minor flooding; 2,180 cubic feet per secondApr 15, 2014: 6.11 ft, minor flooding; 458 cubic feet per secondOct 15, 2014: 6.69 ft, minor flooding; 614 cubic feet per secondDec 24, 2014: 6.78 ft, minor flooding; 648 cubic feet per secondJan 4, 2015: 8.86 ft, minor flooding; 2,319 cubic feet per secondMay 27, 2015: 6.81 ft, minor flooding; 659 cubic feet per secondJul 3, 2015: 8.37 ft, minor flooding; 1,753 cubic feet per secondAug 23, 2015: 6.77 ft, minor flooding; 644 cubic feet per secondOct 4, 2015: 7.16 ft, minor flooding; 823 cubic feet per secondNov 2, 2015: 8.36 ft, minor flooding; 1,743 cubic feet per secondNov 19, 2015: 8.14 ft, minor flooding; 1,527 cubic feet per secondDec 24, 2015: 7.88 ft, minor flooding; 1,301 cubic feet per secondDec 29, 2015: 6.83 ft, minor flooding; 666 cubic feet per secondJan 16, 2016: 7.67 ft, minor flooding; 1,146 cubic feet per secondJan 22, 2016: 7.38 ft, minor flooding; 950 cubic feet per secondFeb 24, 2016: 7.02 ft, minor flooding; 742 cubic feet per secondApr 6, 2017: 6.28 ft, minor flooding; 495 cubic feet per secondFeb 4, 2018: 6.99 ft, minor flooding; 726 cubic feet per secondApr 23, 2018: 7.16 ft, minor flooding; 823 cubic feet per secondNov 13, 2018: 8.54 ft, minor flooding; 1,992 cubic feet per secondDec 1, 2018: 6.11 ft, minor flooding; 807 cubic feet per secondDec 9, 2018: 7.59 ft, minor flooding; 1,207 cubic feet per secondDec 28, 2018: 8.39 ft, minor flooding; 1,820 cubic feet per secondJan 4, 2019: 6.26 ft, minor flooding; 840 cubic feet per secondJan 24, 2019: 6.80 ft, minor flooding; 968 cubic feet per secondFeb 21, 2019: 8.02 ft, minor flooding; 1,455 cubic feet per secondMar 4, 2019: 6.40 ft, minor flooding; 872 cubic feet per secondApr 19, 2019: 8.32 ft, minor flooding; 1,745 cubic feet per secondJan 3, 2020: 6.05 ft, minor flooding; 796 cubic feet per secondFeb 6, 2020: 8.80 ft, minor flooding; 2,319 cubic feet per secondFeb 11, 2020: 7.14 ft, minor flooding; 1,056 cubic feet per secondFeb 19, 2020: 7.15 ft, minor flooding; 1,059 cubic feet per secondMar 5, 2020: 7.10 ft, minor flooding; 1,045 cubic feet per secondMar 25, 2020: 6.68 ft, minor flooding; 938 cubic feet per secondApr 13, 2020: 7.30 ft, minor flooding; 1,107 cubic feet per secondSep 17, 2020: 7.11 ft, minor flooding; 1,048 cubic feet per secondOct 11, 2020: 9.02 ft, minor flooding; 2,630 cubic feet per secondOct 29, 2020: 6.15 ft, minor flooding; 816 cubic feet per secondNov 12, 2020: 6.51 ft, minor flooding; 897 cubic feet per secondJan 2, 2021: 7.68 ft, minor flooding; 1,251 cubic feet per secondJan 26, 2021: 6.15 ft, minor flooding; 816 cubic feet per secondMar 26, 2021: 6.51 ft, minor flooding; 897 cubic feet per secondMay 5, 2021: 6.57 ft, minor flooding; 912 cubic feet per secondSep 21, 2021: 7.59 ft, minor flooding; 1,207 cubic feet per secondDec 30, 2021: 6.96 ft, minor flooding; 1,008 cubic feet per secondFeb 4, 2022: 7.05 ft, minor flooding; 1,032 cubic feet per secondFeb 18, 2022: 6.37 ft, minor flooding; 865 cubic feet per secondMar 9, 2022: 6.79 ft, minor flooding; 966 cubic feet per secondApr 6, 2022: 7.19 ft, minor flooding; 1,070 cubic feet per secondJul 9, 2022: 6.57 ft, minor flooding; 912 cubic feet per secondNov 30, 2022: 6.87 ft, minor flooding; 985 cubic feet per secondDec 6, 2022: 7.64 ft, minor flooding; 1,234 cubic feet per secondDec 15, 2022: 6.94 ft, minor flooding; 1,002 cubic feet per secondJan 4, 2023: 8.84 ft, minor floodingJan 25, 2023: 6.86 ft, minor floodingFeb 17, 2023: 6.57 ft, minor flooding; 912 cubic feet per secondMar 12, 2023: 6.13 ft, minor flooding; 811 cubic feet per secondApr 9, 2023: 7.69 ft, minor flooding; 1,256 cubic feet per secondDec 26, 2023: 6.91 ft, minor flooding; 995 cubic feet per secondJan 9, 2024: 8.52 ft, minor flooding; 1,968 cubic feet per secondJan 25, 2024: 7.14 ft, minor flooding; 1,056 cubic feet per secondFeb 13, 2024: 7.15 ft, minor flooding; 1,059 cubic feet per secondMar 2, 2024: 6.20 ft, minor flooding; 826 cubic feet per secondMar 6, 2024: 7.39 ft, minor flooding; 1,138 cubic feet per secondSep 27, 2024: 8.47 ft, minor flooding; 1,910 cubic feet per secondDec 11, 2024: 6.20 ft, minor flooding; 826 cubic feet per secondDec 29, 2024: 6.09 ft, minor flooding; 803 cubic feet per secondFeb 13, 2025: 8.19 ft, minor flooding; 1,610 cubic feet per secondApr 7, 2025: 6.06 ft, minor flooding; 797 cubic feet per secondFeb 27, 2026: 6.76 ft, minor flooding; 958 cubic feet per second Highest, 10.43 ft, Sep 22, 2009 2010201520202025

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Big Creek at GA 9 near Cumming 2000s: 2 2010s: 61 61 2020s: 42 2000s2010s2020s
  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

The 50 highest of 105 listed crests.

Highest listed crests, Big Creek at GA 9 near Cumming
1Sep 22, 200910.43+4.43Minor4,800
2Aug 1, 20139.15+3.15Minor2,693
3Oct 11, 20209.02+3.02Minor2,630
4Jan 4, 20158.86+2.86Minor2,319
5Jan 4, 20238.84+2.84Minor—
6Feb 6, 20208.80+2.80Minor2,319
7Apr 7, 20148.76+2.76Minor2,180
8Nov 13, 20188.54+2.54Minor1,992
9Jan 9, 20248.52+2.52Minor1,968
10Sep 27, 20248.47+2.47Minor1,910
11Dec 23, 20138.46+2.46Minor1,840
12Dec 28, 20188.39+2.39Minor1,820
13Jul 3, 20158.37+2.37Minor1,753
14Nov 2, 20158.36+2.36Minor1,743
15Aug 19, 20138.33+2.33Minor1,713
16Apr 19, 20198.32+2.32Minor1,745
17Aug 7, 20138.28+2.28Minor1,664
18May 19, 20138.24+2.24Minor1,625
19Feb 13, 20258.19+2.19Minor1,610
20Jul 17, 20108.14+2.14Minor1,527
21Nov 19, 20158.14+2.14Minor1,527
22May 5, 20138.13+2.13Minor1,517
23Mar 9, 20118.12+2.12Minor1,500
24Feb 21, 20198.02+2.02Minor1,455
25Dec 24, 20157.88+1.88Minor1,301
26Mar 15, 20087.84+1.84Minor1,270
27Apr 9, 20237.69+1.69Minor1,256
28Jan 2, 20217.68+1.68Minor1,251
29Jan 16, 20167.67+1.67Minor1,146
30Dec 6, 20227.64+1.64Minor1,234
31Jan 31, 20137.60+1.60Minor1,093
32Dec 9, 20187.59+1.59Minor1,207
33Sep 21, 20217.59+1.59Minor1,207
34Jul 4, 20137.48+1.48Minor1,008
35Mar 6, 20247.39+1.39Minor1,138
36Jan 22, 20167.38+1.38Minor950
37Mar 24, 20137.33+1.33Minor921
38Apr 16, 20117.32+1.32Minor915
39Apr 13, 20207.30+1.30Minor1,107
40Dec 9, 20137.27+1.27Minor886
41Dec 26, 20127.20+1.20Minor845
42Apr 6, 20227.19+1.19Minor1,070
43Oct 4, 20157.16+1.16Minor823
44Apr 23, 20187.16+1.16Minor823
45Feb 19, 20207.15+1.15Minor1,059
46Feb 13, 20247.15+1.15Minor1,059
47Feb 11, 20207.14+1.14Minor1,056
48Jan 25, 20247.14+1.14Minor1,056
49Jan 11, 20147.11+1.11Minor793
50Sep 17, 20207.11+1.11Minor1,048

The worst floods along the Big Creek

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

September 22, 2009: 10.43 ft here, minor flooding

August 1, 2013: 9.15 ft here, minor flooding

October 11, 2020: 9.02 ft here, minor flooding

Gauges on the Big Creek

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

Flood gauges on the Big Creek
GA 9 near Cumming this gaugeGA6.010.43 ft, Sep 22, 20090
AlpharettaGA7.013.05 ft, Feb 3, 19821
Hog Wallow at RoswellGA10.015.41 ft, Sep 22, 20090

Other gauges in Forsyth County

Flood gauges in Forsyth County
Old Atlanta Road near Suwanee10.015.64 ft, Oct 11, 20200

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

NOAA National Water Prediction Service, gauge CMGG1, 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.