Big Creek at GA 9 near Cumming

1. 14.00 ftModerate flooding continues with significant flooding expanding further into the woodlands and pasture near the creek. The sidewalk and boardwalk of the Big Creek Greenway will be completely flooded out with several feet of water. Around two feet of water will be flowing over portions of the Atlanta Highway. This will likely cause a washout of the road near the culvert. The water level will also be reaching the bottom of the bridge on Majors Road.
2. 12.00 ftModerate flooding begins with significant flooding expanding further into the woodlands and pasture near the creek. The sidewalk and boardwalk of the Big Creek Greenway will be completely flooded out with several feet of water. The water will begin flowing over portions of the Atlanta Highway. Extensive erosion of the banks near the culvert may cause a washout.
3. 10.00 ftMinor flooding continues to expand further into the woodlands and pasture near the creek. The sidewalk and boardwalk of the Big Creek Greenway will be completely flooded out. The areas under the Georgia 400 Highway and McFarland Road will be covered with around five feet of water. A portion of the sidewalk under Majors Road will be covered with around six feet of water. Maximum flow will be reached through the culvert at Atlanta Highway and erosion of the banks near the bridge will begin.
4. 8.00 ftMinor flooding will expand into the natural flood plain of the creek upstream and downstream from the gage at Atlanta Highway or Georgia Highway 9. Most of the sidewalk and boardwalk of the Big Creek Greenway will be under a foot or two of water. The areas under the Georgia 400 Highway and McFarland Road will be covered with around three feet of water. A portion of the sidewalk under Majors Road will be covered with around four feet of water.
5. 7.00 ftMinor flooding continues to expand into the natural flood plain of the creek upstream and downstream from the gage at Atlanta Highway or Georgia Highway 9. Large portions of the sidewalk and boardwalk of the Big Creek Greenway will be flooded. The areas under the Georgia 400 Highway and McFarland Road will be covered with around two feet of water. A portion of the sidewalk under Majors Road will be covered with around 3 feet of water.
6. 6.00 ftFlood stage is reached. Minor flooding will expand into the natural flood plain of the creek upstream and downstream from the gage at Atlanta Highway or Georgia Highway 9. Large portions of the sidewalk and boardwalk of the Big Creek Greenway will begin to flood. The areas under the Georgia 400 Highway and McFarland Road will be covered with around one foot of water. A portion of the sidewalk under Majors Road will be covered with around two feet of water.
7. 5.00 ftBankfull conditions continue to expand into low lying areas of the creek upstream and downstream from the gage at Atlanta Highway or Georgia Highway 9. Portions of the sidewalk on the Big Creek Greenway under the Georgia 400 Highway and McFarland Road begin to flood. A portion of the sidewalk under Majors Road will be covered with around one foot of water. The water level will begin reaching the bottom of the boardwalk along several sections of the Greenway.
8. 4.00 ftBankfull conditions are reached in some low lying areas of the creek upstream and downstream from the gage at Atlanta Highway or Georgia Highway 9. A small portion of the sidewalk on the Big Creek Greenway under Majors Road will begin to flood.

Most recent crests

• February 27, 2026: 6.76 ft
• April 7, 2025: 6.06 ft
• February 13, 2025: 8.19 ft
• December 29, 2024: 6.09 ft
• December 11, 2024: 6.20 ft
• September 27, 2024: 8.47 ft
• March 9, 2024: 6.73 ft
• March 6, 2024: 7.39 ft
• March 2, 2024: 6.20 ft
• February 13, 2024: 7.15 ft

• DownstreamBig Creek at Alpharetta
• Dick Creek at Old Atlanta Road near Suwanee
• Chattahoochee River at Buford Dam near Buford
• Chattahoochee River at Lake Sidney Lanier near Buford
• Richland Creek at Suwanee Dam Road near Buford
• Level Creek at Suwanee Dam Road near Suwanee
• Chattahoochee River at 0.76 mile upstream McGinnis Ferry near Suwanee
• Settingdown Creek at Ball Ground

Forecasts by the Southeast River Forecast Center. Forecasts are issued as needed during times of high water, but are not routinely available. Automated gauge readings are now available, courtesy of the USGS.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.