Big Creek near Alpharetta, GA

River level and flood forecast · Fulton County

Normal2.3 ftas of Mon 3:45 PM

The river is 4.8 ft below flood stage (7 ft).

Forecast to fall to 1.5 ft by Sat, Oct 17, 8 AM.

Flow: 61 cubic feet per second (USGS).

The last 7 days and the forecast

NWS forecast issued Mon, Oct 12, 10:53 AM. Forecasts change as rain falls and as upstream water arrives.

Flood stages

Major flood stage	13 ft
Moderate flood stage	11 ft
Flood stage	7 ft
Action stage	6 ft
Record crest (February 3, 1982)	13.05 ft

What floods at each level

From the National Weather Service, highest first.

19 ftCatastrophic flooding occurs along the creek with water reaching the bottom of Kimball Bridge Road. Webb Bridge Road...McGinnis Ferry Road...Windward Parkway...Haynes Bridge Road...and Georgia 400 will be under a few feet of water. Apartments on Gran Crique Drive and Jameson Pass in Alpharetta and numerous homes on Jade Cove Circle and La View Circle near Roswell will be flooded. Rock Mill Park will be completely under water. Flood waters begin to reach several buildings in the Northpoint Mall complex.
17 ftFlooding never seen before will affect portions of Alpharetta along the creek. Webb Bridge Road...McGinnis Ferry Road...Haynes Bridge Road...Old Holcomb Bridge Road and Georgia 400 will be under water. Several apartments on Gran Crique Drive and numerous homes on Jade Cove Circle and La View Circle near Roswell will be flooded. Flooding expands in the Rock Mill Park with water covering the concrete pad of the octagon pavilion and half of the parking lot. The Big Creek Greenway is flooded up to 11 feet deep.
15 ftRecord flooding continues upstream and downstream from Kimball Bridge Road. Flooding occurs on Webb Bridge Road...McGinnis Ferry Road...Haynes Bridge Road...Old Holcomb Bridge Road and Georgia 400. Flood waters enter several apartments on Gran Crique Drive and numerous homes on Jade Cove Circle and La View Circle near Roswell. Flooding expands in the Rock Mill Park with water covering the concrete pad of the square pavilion and more of the parking lot. The Big Creek Greenway is flooded up to 9 feet deep.
14 ftRecord flooding occurs upstream and downstream from Kimball Bridge Road. Flooding occurs on Webb Bridge Road...McGinnis Ferry Road...Haynes Bridge Road and Old Holcomb Bridge Road. Flood waters enter several apartments on Gran Crique Drive and numerous homes on Jade Cove Circle and La View Circle near Roswell. Flooding expands in the Rock Mill Park with the water covering the concrete pad of the square pavilion and more of the parking lot. The Big Creek Greenway is flooded up to 8 feet deep.
13 ftMajor flooding begins with water hitting a foot bridge just downstream of the gage on Kimball Bridge Road. Flooding begins on Webb Bridge Road...McGinnis Ferry Road and in the backyards of homes off Society Street. Flood waters reach the foundations of apartments on Gran Crique Drive...and homes on Jade Cove Circle and La View Circle near Roswell. The Big Creek Greenway is flooded up to 7 feet deep. A large portion of Rock Mill Park is flooded and the lower end of the parking lot is affected.
12 ftSignificant flooding expands along the creek as water reaches the bottom of a foot bridge just downstream of the gage on Kimball Bridge Road. Backyards of homes off Seale Drive and Gunter Court and portions of the Golf Club of Georgia are under 3 feet of water. Backyards of homes off Jade Cove Circle and La View Circle near Roswell will be under a foot of water. The Big Creek Greenway is flooded up to 6 feet deep. Flooding covers portions of Rock Mill Park and the YMCA Campground off Preston Ridge Road.
11 ftModerate flooding begins and occurs upstream and downstream from the gage on Kimball Bridge Road near Rock Mill Park. Backyards of homes off Seale Drive and Gunter Court and portions of the Golf Club of Georgia are under two feet of water. Backyards of homes off Jade Cove Circle and La View Circle near Roswell begin to flood. The Big Creek Greenway will be flooded up to 5 feet deep and will be closed. A large portion of the YMCA Campground off Preston Ridge Road will be under 3 feet of water.
10 ftMinor flooding expands along the creek from near Cumming to Alpharetta and Roswell. Backyards of homes off Seale Drive and Gunter Court and portions of the Golf of Georgia are under a foot of water. The Big Creek Greenway experiences significant flooding up to 4 feet deep with closure of the paths. This especially occurs upstream and downstream from the gage on Kimball Bridge Road and Rock Mill Park. A large portion of the YMCA Campground off Preston Ridge Road will be under a two feet of water.
9 ftMinor flooding expands along the creek from near Cumming to Alpharetta and Roswell. Backyards of homes off Seale Drive and Gunter Court and portions of the Golf of Georgia begin to flood. The Big Creek Greenway experiences significant flooding up to 3 feet deep...which results in closure of most of the paths. This especially occurs upstream and downstream from the gage on Kimball Bridge Road and Rock Mill Park. A large portion of the YMCA Campground off Preston Ridge Road will be under a foot of water.
8 ftMinor flooding continues to expand further into the woodlands and fields along the creek from near Cumming in south Forsyth County to Alpharetta and Roswell in north Fulton County. Additional portions of The Big Creek Greenway have minor flooding with 1 to 2 feet of water. Most of the walking and biking paths will be closed...especially upstream and downstream from the gage on Kimball Bridge Road and near Rock Mill Park. Portions of the YMCA Campground off Preston Ridge Road will flood.
7 ftFlood Stage is reached. Minor flooding of woodlands and fields begin along the creek between Cumming in Forsyth County...to Alpharetta and Roswell in North Fulton County. Flooding starts to effect portions of The Big Creek Greenway near Alpharetta and some portions may become closed with around one foot of water...especially upstream and downstream from the gage on Kimball Bridge Road and near Rock Mill Park. Portions of the YMCA Campground off Preston Ridge Road will begin to flood.
6 ftBankfull conditions are reached along the creek between Cumming in Forsyth County...to Alpharetta and Roswell in North Fulton County. Some low lying spots along The Big Creek Greenway will begin to flood with a few inches of water upstream and downstream from the gage on Kimball Bridge Road. Water will begin to enter low portions of the YMCA Campground off Preston Ridge Road.

Highest crests on record

13.05 ft — February 3, 1982
12.81 ft — March 17, 1990
12.54 ft — February 21, 1961
12.5 ft — September 22, 2009
12.3 ft — December 6, 1983

Recent crests: 7.45 ft (February 28, 2026) · 7.53 ft (April 8, 2025) · 10.29 ft (February 14, 2025) · 7.49 ft (December 12, 2024) · 10.77 ft (September 27, 2024)

Up and down the river, and nearby

See it on the live map →Radar & warnings for Fulton County NWS gauge page USGS gauge 02335700

Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (APHG1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.