
This photograph, dated 1945, shows the famous Knox covered bridge at Yellow Springs Road in Valley Forge National Park. The visible keystone marker identifies Valley Creek. (Courtesy of Radnor Historical Society)

This new accurate replica was produced in 2013 by KMT in cooperation with the National Park Service.
Valley Creek Road within Valley Forge National Park
Atypical for a stream marker in that it is single sided on a front mount post, but so was the one in the 1945 photo on which this one was patterned.