First of all, I would like to thank Steve Dean for identifying the culvert and the stream flowing through it. Hey, I ride a bike on the towpath for the most part and have little to offer regarding the historical structures of the C&O Canal. However, I can say that many of the culverts literally border on the river itself, and for obvious reasons they can be very difficult to photograph. For starters, when the Potomac is running high, this arch is literally under water. Also, even in low water, a close up often requires the photographer to be wearing a pair of waders. Some things are best left to the professionals! I’m sure everybody has heard the phrase “they don’t build ’em like that anymore,” and this piece of handiwork fits the bill. It has survived roughly 180 years of flooding and frost heave, and it looks little the worse for wear. I just turned 49 and wish I could say the same for myself!