Broad Run Trunk Aqueduct

From www.iceandcoal.org:

The canal crossed Broad Run a 30-foot-long wooden trunk that Hahn classifies as an aqueduct. It was originally a culvert -- a tunnel beneath the canal proper -- but when the culvert washed out it was replaced with the wooden trunk. The canal company, however, never counted it among the aqueducts. The surrounding stonework survives.