Big Creek below Hog Wallow Creek at Roswell, GA Water Level Today

NWS river forecast

Forecast from the NOAA National Water Prediction Service. Issued a few times a day and only while a forecast is active. Not for navigation.

Last 30 days

About this gauge

USGS gauge 02335757 sits on Big Creek and reads everything draining 103 square miles of the Upper Chattahoochee basin. Its datum sits 922 feet above sea level NAVD88. Daily flow has been on record here since 2004, 22 years of it.

Where this gauge sits in the drainage

Two gauged sites sit upstream of here. The closest is Big Creek near Alpharetta, GA, reading 72 square miles. This gauge adds the 31 square miles that drain in between. Downstream the next reading comes from Chattahoochee River below Morgan Falls Dam, GA at 1,370 square miles, so what passes this gauge is about 8% of the water measured there. Water passing here goes on to Chatt River at Powers Fy and I-285 near Atlanta, GA, Chattahoochee River at US 41, at Atlanta, GA and Chattahoochee River at Atlanta, GA.

Normal flows here

Big Creek runs a median of 82 cfs at this gauge across 22 years of record. February is the fullest month at a median 146 cfs, and September the leanest at 40 cfs. The highest daily mean on record is 5,960 cfs in 2009, and the lowest is 6.3 cfs in 2007.

Medians from the USGS daily-statistics record, 2004 to 2026. A month at 100% is running at its own long-term median.

Flood stages and record crests

Big Creek reaches flood stage at this gauge at 10 feet. NWS starts watching it at 9 feet. The highest crest on record is 15.4 feet, in September 2009.

Flood categories and crest history from the NOAA National Water Prediction Service, gauge RWSG1. Stages are gage height, not depth. Not for navigation.

Dams near this gauge

The Army Corps' Morgan Falls Dam is 4 miles from this gauge. The Corps publishes no release schedule for this project; its last observed release and elevations load below.

• Morgan Falls Dam 4 miles
• Buford Dam 19 miles
• Allatoona Dam 24 miles