Alcovy River at New Hope Road near Grayson, GA
River level and flood forecast · Gwinnett County
Normal2.5 ftas of Mon 3:45 PM
The river is 6.5 ft below flood stage (9 ft).
Flow: 28 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 7 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 16 ft |
| Moderate flood stage | 11 ft |
| Flood stage | 9 ft |
| Action stage | 7 ft |
| Record crest (June 17, 2003) | 14.93 ft |
What floods at each level
From the National Weather Service, highest first.
- 15 ftSignificant flooding continues to expand further into the woodlands upstream and downstream from the river gage at New Hope Road. The bridge forms an obstacle and acts like a dam causing some backwater and erosion eddies to the sides of the bridge. The flood water will be around one foot deep over the road and county officials will have the bridge closed. The high water will likely affect the performance of the USGS gaging equipment near the bridge.
- 14 ftSignificant flooding continues to expand further into the woodlands upstream and downstream from the river gage at New Hope Road. The bridge forms an obstacle and acts like a dam causing some backwater and erosion eddies to the sides of the bridge. The water will begin to flood the road and county officials will likely close the bridge. Also the water level reaches the bottom of the USGS gaging equipment near the bridge.
- 13 ftSignificant flooding continues to expand further into the woodlands upstream and downstream from the river gauge at New Hope Road. The bridge forms an obstacle and acts like a dam causing some backwater and erosion eddies to the sides of the bridge. County officials may need to close the bridge.
- 12 ftSignificant flooding expands further into the woodlands upstream and downstream from the river gauge at New Hope Road. The bridge begins to form an obstacle and act like a dam causing some backwater and erosion eddies to the sides of the bridge. County officials may need to close the bridge.
- 11 ftModerate flooding begins. Significant flooding expands further into the woodlands upstream and downstream from the river gauge at New Hope Road. The water level reaches the bottom of the bridge. County officials may need to close the bridge due to erosion to the banks on the sides of the bridge.
- 10 ftMinor flooding continues to expand further into the woodlands upstream and downstream from the river gauge at New Hope Road.
- 9 ftFlood stage is reached. Minor flooding begins of the woodlands upstream and downstream from the river gauge at New Hope Road.
- 7 ftBankfull conditions are reached upstream and downstream from the river gauge at New Hope Road.
Highest crests on record
- 14.93 ft — June 17, 2003
- 13.85 ft — September 22, 2009
- 13.64 ft — April 19, 2019
- 12.74 ft — August 23, 2015
- 12.61 ft — January 9, 2024
Recent crests: 9.5 ft (August 5, 2025) · 9.17 ft (June 13, 2025) · 11.79 ft (February 13, 2025) · 11.97 ft (September 27, 2024) · 10.79 ft (March 6, 2024)
Up and down the river, and nearby
- UpstreamAlcovy River near Lawrenceville, GA
- DownstreamAlcovy River above Covington, GA
- Shoal Creek at Paper Mill Rd near Lawrenceville, GA
- Apalachee River near Fence Road near Dacula, GA
- Brushy Fork Creek at Beaver Road near Loganville, GA
- Pew Creek at Patterson Road near Lawrenceville, GA
- Wildcat Creek (GA) near Lawrenceville, GA
- Yellow River Tributary at Plantation Road near Lawrenceville, GA
- Big Haynes Creek at Lenora Road near Snellville, GA
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (ALCG1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.