Patapsco Valley Traverse and Grist Mill Trail Loop
Patapsco Valley Traverse and Grist Mill Trail Loop
3.1
(5)
87
riders
02:20
37.5km
370m
Cycling
Cycle the moderate 23.3-mile Patapsco Valley Traverse and Grist Mill Trail Loop, exploring historical sites and river views in Patapsco Vall
Last updated: February 26, 2026
Tips
Your route passes through protected areas
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Waypoints
Start point
Parking
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7.95 km
Highlight • Lake
Tip by
12.6 km
Highlight • River
Tip by
37.5 km
End point
Parking
Way Types & Surfaces
Way Types
26.8 km
4.13 km
3.46 km
1.92 km
1.28 km
< 100 m
Surfaces
29.7 km
6.96 km
848 m
114 m
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Elevation
Highest point (150 m)
Lowest point (10 m)
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Weather
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Today
Saturday 23 May
12°C
8°C
99 %
Additional weather tips
Max wind speed: 23.0 km/h
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This route was planned by komoot.
This route is generally considered moderate for touring cyclists. While the core Grist Mill Trail section is paved and largely flat, making it easy and accessible, the full 'Patapsco Valley Traverse and Grist Mill Trail Loop' as a longer route might incorporate varied terrain or local roads that increase the overall difficulty. It's suitable for cyclists with some experience looking for a longer ride.
The Grist Mill Trail itself is typically enjoyed as an out-and-back route, offering a paved and scenic ride along the Patapsco River. The 'Patapsco Valley Traverse and Grist Mill Trail Loop' as described for touring bicycles combines this with other suitable paths or local roads to create a longer loop. Be aware that many other trails in the broader Patapsco Valley State Park are unpaved and rugged, not ideal for touring bikes.
The primary Grist Mill Trail section is predominantly paved and smooth, making it ideal for touring bicycles and those with narrower tires. It is largely flat, offering an accessible experience. If the full loop incorporates other sections, you might encounter well-maintained mixed-use paths or local roads, but the Grist Mill Trail itself is a comfortable paved ride.
The route follows the Patapsco River, offering picturesque views of the water and surrounding forest. You'll pass historical sites like old flour mill ruins, the former Bloede's Dam, and the notable Thomas Viaduct. The trail also parallels active train tracks, providing glimpses of passing trains. You'll also ride near Lost Lake and through the Patapsco Valley State Park Deep Run Area.
Spring and fall offer the most pleasant cycling conditions with mild temperatures and beautiful foliage. Summer can be enjoyable, but be prepared for heat and humidity. Winter cycling is possible, but check trail conditions for ice or snow, especially after precipitation. The paved nature of the Grist Mill Trail makes it accessible year-round, weather permitting.
There are several parking areas within Patapsco Valley State Park that provide access to the Grist Mill Trail. Popular access points include the Avalon Area and the Orange Grove Area. Specific parking availability can vary, so it's advisable to check the official park website for the most current information and directions.
Yes, dogs are generally allowed on trails within Patapsco Valley State Park, including the Grist Mill Trail. They must be kept on a leash no longer than six feet at all times. Please remember to clean up after your pet to help keep the park enjoyable for everyone.
Yes, Patapsco Valley State Park typically charges an entrance fee per vehicle, especially on weekends and holidays, or during peak season. Fees can vary by season and day of the week. You can find the most up-to-date information on fees and any permit requirements on the official Maryland Department of Natural Resources website at maryland.gov.
Yes, the route utilizes and intersects with several other trails within the park. You'll find sections of the Patapsco Traverse (south hiking), Patapsco Traverse (south mtb), Patapsco Alt HoCo Thru Trail, Patapsco Traverse (north hiking), and Patapsco Traverse (north mtb). Other smaller trails like Gray's Mill Trail and Vineyard Spring Trail also intersect or run nearby.
The paved and relatively flat sections of the Grist Mill Trail are very family-friendly and suitable for children learning to cycle or riding with parents. The full 'Patapsco Valley Traverse and Grist Mill Trail Loop' may include longer distances or sections that require more endurance, so consider your family's cycling ability for the entire route. The Grist Mill Trail itself is an excellent choice for a relaxed family outing.
Restrooms and water fountains are typically available at various access points and visitor centers within Patapsco Valley State Park, such as the Avalon and Orange Grove areas. However, availability can be seasonal, so it's always a good idea to carry your own water, especially for longer rides.