Chesapeake & Ohio Canal National Historical Park - National Park Service
Carpendale Trail (also known as the Knobley Tunnel Trail) - West Virginia Rails-to-Trails Council
DIRECTIONS: 
GPS:  15 Howard Street, Cumberland, MD
The address works.  Parking is under I-68 so coordinates might put you on I-68 instead of under.
| Parking under I-68 right off of exit 43B for both the end of the C&O Canal Trail and the start of the Great Allegheny Passage. | 
TRAIL MAP: 
Chesapeake & Ohio Canal Map - National Park Service
DISTANCES: 
This was part of a hiking and biking weekend in Maryland.
Gambrill State Park Hike - 9.2 miles
C&O Trail Bike - 8.6 miles
Great Allegheny Passage Bike Shuttle - 35.7 miles
THE BIKE: 
Being an early riser, adding on an extra hour with the time change and being only 10 minutes away from where I needed to park for my shuttle for the GAP bike ride at 9:00 AM, I was out at the crack of dawn to ride a section of the C&O Canal Trail.
| Walking out of the parking lot and to the right under the SHOPS AT CANAL PLACE sign, the C&O Canal Trail is to the left and the GAP Trail is to the right. | 
| Heading left on the C&O Canal Trail. | 
| At Evitts Creek Aqueduct ... | 
| ... looping around and heading back. | 
| Straight ahead is the Knobley Tunnel Trail. Just under that bridge ... | 
| ... a trail to the left leads up to it. | 
| A bridge over ... | 
| North Branch Potomac River | 
| Knobley Tunnel just after the bridge. Unfortunately, it has been closed since 2019. | 
| I would have ridden through it. Bummer that it was closed. | 
| Heading back. | 
| Coming back into downtown Cumberland. | 
| The last mile marker of the C&O Canal Trail. It starts in Washington DC. | 
| Parking is just the other side of that large brown brick building. | 
| Heading back to my car over there on the right to grab some things then back here and straight ahead a short distance to catch the shuttle bus for my GAP ride. |