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Big Creek at GA 9 near Cumming

National Weather Service gauge CMGG1 · Georgia · Forsyth County · 34.1558, -84.2186 · USGS 02335580

Flood levels

Official flood levels at this gauge: action stage begins at 4.0 ft; minor flooding begins at 6.0 ft; moderate flooding begins at 12.0 ft; major flooding begins at 15.0 ft.

Action stage4.0 ft
Minor flooding6.0 ft
Moderate flooding12.0 ft
Major flooding15.0 ft

Highest recorded crests

What the water does

National Weather Service impact statements for this gauge, in the Weather Service's own words.

4.0 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.
5.0 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.
6.0 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.
7.0 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.
8.0 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.
10.0 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.
12.0 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.
14.0 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.

Forecast office: NWS Peachtree City · River Forecast Center: Southeast River Forecast Center.

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