I found a different thread about riding the C&D Canal with outdated information from 2009 through 2014. I got excited thinking I was going to ride coast to coast and loop around. Not so, but the ride was better than I thought it would be. Here's an update for 2018. During my ride I met one of the Army engineers [they maintain the service roads and trails] who schooled me on the legal places to ride. According to the engineer, riding both sides of the canal isn't legal anymore since the Castle Trail was paved. He said I could ride any of the three "tiers" as long as they weren't gated. And he warned me not to ride the single track intersecting the service roads. Maybe there are some places on the Castle Trail side of the canal to ride off to the west closer to Chesapeake City--let us know if this is the case. I'll explore the north side another day. But the good news is that we have three tiers of mostly parallel tracks, each one 9 miles long--yep, 27 miles of unpaved roads along the canal. My GPX file is attached showing how I started at Main Street and headed west on the canal road at water level, then back east on tier two mid-level, and then back west at the highest level of roads, finishing at the canal museum. The canal has the most unpaved miles I have found within an hour of Harford County. I ride that long to get to Fishing Creek Road in southern Lancaster PA and that's only a few miles long--but three cool shallow water crossings makes it worth the ride. Along the canal, you can enter from the west at the canal museum on Bethel Rd. Another entry point is in the middle of the canal at Old Summit Bridge Rd. Or you can enter from the east at Main Street. Here's the view entering from Main Street. Entering the gravel road to the right you see this. The road to the right is gated, so you can't ride toward Delaware City. Make a left and head west toward Chesapeake City. Here's the view showing the RT 13 bridge near and the RT1 Roth Bridge farther away. You're seeing the canal road, which is tier 1, closest to the water. But there are 11 spur trails to the left that take you to the 2nd tier, and spurs off of that taking you to tier 3 at the highest ground. Next spur. Another spur to the left. Here's the spur at the natural gas line. Next spur. This is one of the few fishing piers that are in good shape. Many are missing wood planks and no longer in use. The spur trails to the left take you to Old Summit Bridge Rd. Here's the crossroads at the bottom of Summit Bridge Rd. The engineer explained that the canal road washes out in some places, and then they create a spur trail to get up and around the problem. Here's the only wash-out I found. It's about a mile from the canal museum headed west. And here's the trail head on the west side by the canal museum. This is a good view of the three tiers of trails, low [canal road water level], middle and high. The highest tier is gated at the west end, but it's accessible at various points. The tiers intersect at various points, but mostly run parallel to each other. Tiers 2 and 3 are dirt. Tier 1 is gravel. Looking forward to riding the canal roads more this summer. Maybe I'll see some inmates on the trail.