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Sewell Mill Creek at GA 120 near Marietta

Highest listed crest 13.26 ftFlood stage 11.0 ft3 crests since 2009

The Sewell Mill Creek at GA 120 near Marietta crested above flood stage 3 times among the 3 crests the National Weather Service lists from 2009 to 2021. The highest, 13.26 ft on September 21, 2009, was minor flooding, 2.26 feet above flood stage.

The gauge

Highest listed crest
13.26 ft
September 21, 2009; 1,164 cubic feet per second
Flood stage
11.0 ft
Major flooding from 20.0 ft
Crests at major
0
3 above flood stage
Most recent flood crest
September 8, 2021
11.32 ft, minor flooding
Location
Cobb County
Near Marietta (5.5 mi), Sandy Springs (5.8 mi), Roswell (7.1 mi)

Flood stages

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

Flood categories, Sewell Mill Creek at GA 120 near Marietta
Action stage9.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)11.03Sep 8, 2021Minimal or no property damage, but possibly some public threat
Moderate flood stage16.00—Some inundation of structures and roads near the stream
Major flood stage20.00—Extensive inundation of structures and roads

Every listed crest

3 crests from 2009 to 2021. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Sewell Mill Creek at GA 120 near Marietta, 2009 to 2021 101214161820ft Flood stage 11.0 ftMajor 20.0 ft Sep 21, 2009: 13.26 ft, minor flooding; 1,164 cubic feet per secondJul 12, 2012: 12.21 ft, minor flooding; 1,059 cubic feet per secondSep 8, 2021: 11.32 ft, minor flooding; 970 cubic feet per second Highest, 13.26 ft, Sep 21, 2009 201020152020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Sewell Mill Creek at GA 120 near Marietta 2000s: 1 1 2010s: 1 2020s: 1 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

Highest listed crests, Sewell Mill Creek at GA 120 near Marietta
1Sep 21, 200913.26+2.26Minor1,164
2Jul 12, 201212.21+1.21Minor1,059
3Sep 8, 202111.32+0.32Minor970

Other gauges in Cobb County

Flood gauges in Cobb County
Stilesboro Road near Acworth13.023.90 ft, Sep 21, 20091
Mack Dobbs Road near Kennesaw11.014.27 ft, Sep 21, 20090
US 41 at Atlanta14.028.59 ft, Sep 22, 20095
US Highway 78 and 278 near Mableton10.019.85 ft, Sep 22, 20090
Chastain Meadows Parkway near Kennesaw11.011.94 ft, Sep 27, 20240
Hawkins Store Road near Blackwells11.017.31 ft, Sep 21, 20090
Shallowford River near Woodstock10.019.66 ft, Sep 21, 20091
Powder Springs Road near Powder Springs11.023.20 ft, Sep 22, 20091
Clay Road near Austell12.027.40 ft, Sep 22, 20091
Powder Springs11.019.82 ft, Sep 21, 20090
Interstate North Parkway near Smyrna14.014.67 ft, Sep 8, 20210
Lower Roswell Road near Marietta12.021.10 ft, Mar 30, 19776
Brownsville Road near Powder Springs13.031.45 ft, Sep 21, 20091
Northwest Austell19.037.04 ft, Sep 22, 20091
GA 120 near Roswell12.014.70 ft, Sep 21, 20090

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

NOAA National Water Prediction Service, gauge SMCG1, 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.