Olley Creek at Clay Road near Austell

Highest listed crest 27.40 ftFlood stage 12.0 ft1 crests since 2009

The Olley Creek at Clay Road near Austell crested at major flood stage 1 time among the 1 crests the National Weather Service lists from 2009 to 2009. The highest, 27.40 ft on September 22, 2009, was major flooding, 15.40 feet above flood stage.

The gauge

Highest listed crest: 27.40 ft; September 22, 2009
Flood stage: 12.0 ft; Major flooding from 18.0 ft
Crests at major: 1; 68th of 271 gauges in Georgia
Most recent flood crest: September 22, 2009; 27.40 ft, major flooding
Location: Cobb County; Near Powder Springs (3.5 mi), Mableton (3.5 mi), Smyrna (6.9 mi)
Identifiers: NWS OLYG1; USGS 02336986

Flood stages

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

Flood categories, Olley Creek at Clay Road near Austell

Action stage	9.0	0	—	The level at which the NWS or its partners begin to take action
Flood stage (minor)	12.0	0	—	Minimal or no property damage, but possibly some public threat
Moderate flood stage	15.0	0	—	Some inundation of structures and roads near the stream
Major flood stage	18.0	1	Sep 22, 2009	Extensive inundation of structures and roads

Every listed crest

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

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.
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, Olley Creek at Clay Road near Austell

1	Sep 22, 2009	27.40	+15.40	Major	—

Other gauges in Cobb County

Flood gauges in Cobb County

Stilesboro Road near Acworth	13.0	23.90 ft, Sep 21, 2009	1
Mack Dobbs Road near Kennesaw	11.0	14.27 ft, Sep 21, 2009	0
US 41 at Atlanta	14.0	28.59 ft, Sep 22, 2009	5
US Highway 78 and 278 near Mableton	10.0	19.85 ft, Sep 22, 2009	0
Chastain Meadows Parkway near Kennesaw	11.0	11.94 ft, Sep 27, 2024	0
Hawkins Store Road near Blackwells	11.0	17.31 ft, Sep 21, 2009	0
Shallowford River near Woodstock	10.0	19.66 ft, Sep 21, 2009	1
Powder Springs Road near Powder Springs	11.0	23.20 ft, Sep 22, 2009	1
Powder Springs	11.0	19.82 ft, Sep 21, 2009	0
Interstate North Parkway near Smyrna	14.0	14.67 ft, Sep 8, 2021	0
GA 120 near Marietta	11.0	13.26 ft, Sep 21, 2009	0
Lower Roswell Road near Marietta	12.0	21.10 ft, Mar 30, 1977	6
Brownsville Road near Powder Springs	13.0	31.45 ft, Sep 21, 2009	1
Northwest Austell	19.0	37.04 ft, Sep 22, 2009	1
GA 120 near Roswell	12.0	14.70 ft, Sep 21, 2009	0

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

NOAA National Water Prediction Service, gauge OLYG1, 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.