The new bridge is open over Morris Branch connecting the Amberly Lake Greenway and Morris Branch Greenway east of Yates Store Road and west of Green Level Church Road.  This creates a loop that circumnavigates Amberly Lake.

I went out and took some measurements with a Lufkin Measuring Wheel.

Lap 1: 2,987 feet
Lap 2: 2,981 feet

Then I used an iPhone app, Pedometer, and got:

Lap 3: .563 Miles or 2,973 feet

The Pedometer app was more accurate than I expected.

This gives us an average of 2,980 or .56 miles.

I guess we can call it 1/2 a mile.