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Oostanaula River at Calhoun, GA

River level and flood forecast · Gordon County

Normal3.9 ftas of Mon 4:15 PM

The river is 17.1 ft below flood stage (21 ft).

The last 7 days and the forecast

010203040TueWedThuFriSatSunMonAction 18 ftFlood 21 ftModerate 30 ftMajor 35 ftNowObserved (ft)NWS forecast

NWS forecast issued Sun, Dec 31, 7 PM. Forecasts change as rain falls and as upstream water arrives.

Flood stages

Major flood stage35 ft
Moderate flood stage30 ft
Flood stage21 ft
Action stage18 ft
Record crest (February 19, 1990)34.15 ft

What floods at each level

From the National Weather Service, highest first.

  • 37 ftNear record flooding occurs with widespread innundation flooding in the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. Flood waters up to 8 feet deep will be affecting the athletic fields at the Harris River Park on Mauldin Road and additional athletic fields near the boat ramp off the Georgia Highway 136 Connector. The water level will reach the bottom of the North River Street bridge and begin to flood portions of the road.
  • 35 ftMajor flooding begins. Widespread innundation flooding occurs in the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. Flood waters up to 6 feet deep will be affecting the athletic fields at the Harris River Park on Mauldin Road and additional athletic fields near the boat ramp off the Georgia Highway 136 Connector. The water level will be approaching the foundation of a textile mill in Calhoun.
  • 34 ftSignificant flooding continues to expand further into the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. A boat ramp and small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under at least 13 feet of water. Flood waters up to 4 feet deep will be affecting the athletic fields at the Harris River Park on Mauldin Road and additional athletic fields near the boat ramp.
  • 32 ftSignificant flooding continues to expand into the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. A boat ramp and small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under at least 11 feet of water. Flood waters up to two feet deep will be affecting the athletic fields at the Harris River Park on Mauldin Road and additional athletic fields near the boat ramp.
  • 30 ftModerate flooding beings. Significant flooding expands into the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. A boat ramp and small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under at least 9 feet of water. Flood waters will be approaching athletic fields at the Harris River Park on Mauldin Road and additional athletic fields near the boat ramp.
  • 29 ftMinor flooding continues to expand much further into the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. A boat ramp and small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under at least 8 feet of water. Flood water will begin to fill in low areas near athletic fields at the Harris River Park on Mauldin Road.
  • 27 ftMinor flooding continues to expand further into the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. A boat ramp and small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under at least 6 feet of water.
  • 25 ftMinor flooding continues to expand into the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. A boat ramp and small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under at least 4 feet of water.
  • 23 ftMinor flooding continues to expand into the woodlands...fields and pastures upstream and downstream from the gage behind the water treatment plant off Mauldin Road. A boat ramp and small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under at least 2 feet of water.
  • 21 ftMinor flooding begins of woodlands...fields and pastures upstream and downstream from the gage behind a water treatment plant off Mauldin Road. A boat ramp and portions of a small parking lot on the upstream and right bank side of the Georgia Highway 136 Connector will be under water.
  • 18 ftBankfull is reached upstream and downstream from the river gauge behind the water treatment plant off Mauldin Road. The water level reaches the top of the boat ramp just upstream from the Georgia Highway 136 Connector or North River Street bridge.

Highest crests on record

  1. 34.15 ft — February 19, 1990
  2. 29.97 ft — December 28, 2015
  3. 29.71 ft — March 24, 1980
  4. 29.1 ft — January 6, 1982
  5. 28.12 ft — March 28, 2021

Recent crests: 21.83 ft (April 9, 2025) · 21.6 ft (February 14, 2025) · 22.54 ft (May 11, 2024) · 7.05 ft (January 4, 2023) · 22.5 ft (February 6, 2022)

Up and down the river, and nearby

See it on the live map →Radar & warnings for Gordon CountyNWS gauge pageUSGS gauge 02387520

Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (CALG1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.