Fort Powhatan is a former river defense fort located at Windmill Hill (also called Hood's Bluff) near Garysville, Virginia, 2.5 miles (4.0 km) southeast of Flowerdew Hundred Plantation in Prince George County, Virginia.

It is on the south bank of the James River, sited to prevent enemy vessels proceeding upriver to Richmond.

In January 1781, British forces under Benedict Arnold attacked and dismantled the battery and went on to burn Richmond.

In 1808 this was replaced by the federal government with Fort Powhatan, part of what was later called the second system of US fortifications.

The fort was not begun until late 1781,[4] two months after British general Cornwallis surrendered at Yorktown, and was never attacked.

The star fort (with a semi-circular water battery) was still incomplete in 1811 (though barracks for one company were complete), and was not armed until the War of 1812 broke out.