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Alcovy River at New Hope Road near Grayson

National Weather Service gauge ALCG1 · Georgia · Gwinnett County · 33.9169, -83.8881 · USGS 02208150

Flood levels

Official flood levels at this gauge: action stage begins at 7.0 ft; minor flooding begins at 9.0 ft; moderate flooding begins at 11.0 ft; major flooding begins at 16.0 ft.

Action stage7.0 ft
Minor flooding9.0 ft
Moderate flooding11.0 ft
Major flooding16.0 ft

Highest recorded crests

What the water does

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

7.0 ftBankfull conditions are reached upstream and downstream from the river gauge at New Hope Road.
9.0 ftFlood stage is reached. Minor flooding begins of the woodlands upstream and downstream from the river gauge at New Hope Road.
10.0 ftMinor flooding continues to expand further into the woodlands upstream and downstream from the river gauge at New Hope Road.
11.0 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.
12.0 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.
13.0 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.
14.0 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.
15.0 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.

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

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