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Seneca Trails Route



32.4 mile 52.1 kilometer loop
99% Runnable


Ascent: 1,421' 433 m
Descent: -1,434' -437 m
High: 412' 126 m
Low: 198' 60 m


Avg Grade: 2% (1°)
Max Grade: 15% (8°)


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Map Key

Trail shared by Pam Smith

A singletrack route including all three of the 'Seneca' trails in MoCo.

Pam Smith

Features Lake · River/Creek · Views · Wildlife


The route follows portions of Seneca Creek Greenway Trail, Seneca Bluff Trail, and the Seneca Ridge Trail.

Runner Notes

This was the 2015 route for the Seneca Creek Greenway Trail Marathon & 50K, as well as the Stone Mill 50 Mile 2015. For more information on the races,


The route starts and ends in Seneca Creek State Park, near the playground. From there, head east towards the Long Draught Trail which joins up with the Seneca Creek Greenway Trail. Follow the blazes until the parking lot on Rte 28 (Darnstown Rd).

Pick up the Seneca Bluff Trail by leaving the parking lot and crossing the road. Continue moving to the west...away from trail you just came from and against traffic. The new trail will be on your left. Continue on the Seneca Bluff Trail until it eventually comes out on River Rd. Turn left and cross the bridge (do not cross the street) and turn onto Seneca Rd. If you end up at Rileys Lock, you've gone the wrong way!

From Seneca Rd, pick up the Seneca Creek Greenway Trail on your left. Follow the Seneca Creek Greenway Trail back to Rte 28 (this time the trail goes underneath Rte 28) and on towards Black Rock Mill.

From Black Rock Rd, it is about 26 miles if you return to Seneca Creek Park via the Seneca Creek Greenway Trail (on the other side of the bridge and stream). If you choose to continue on the Seneca Ridge Trail and include a lap around Clopper lake once back at the park, the total distance is closer to 50K (maybe a bit over!)

History & Background

There is a former working mill with interpretive outdoor exhibits located at Black Rock Rd.

Run this trail?

We need help with the following missing trail information:

Need to Know, Dogs Allowed, Flora & Fauna


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  4.0 from 2 votes
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in Maryland


84 Views Last Month
2,651 Since Feb 23, 2016



Seneca Fall Reflections.
Jun 1, 2015 near Gaither…, MD
View of Clopper Lake on Dec. 31, 2019
Dec 31, 2019 near Germantown, MD
colorful wildlife
Jan 16, 2018 near Germantown, MD
Clopper Lake Panorama
May 20, 2015 near Gaither…, MD
View of Clopper Lake from the end of the trail near the parking lot.
May 8, 2015 near Germantown, MD
Clopper Lake Feeder Stream
Jun 1, 2015 near Gaither…, MD


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