Patapsco-Thru Trail Loop

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Patapsco Valley State Park

Patapsco-Thru Trail Loop is a 2.8 mile loop trail located near Catonsville, Maryland that features a river and is rated as moderate. The trail offers a number of activity options and is best used from March until November. Dogs are also able to use this trail.

Distance: 2.8 miles Elevation Gain: 305 feet Route Type: Loop

dog friendly

kid friendly

hiking

nature trips

walking

bird watching

running

forest

river

views

Note: Trail may be closed due to construction. Please check with the park page for more information.

The loop was fun and beautiful to hike. Parking was a breeze at the end of the street, and coordinates got us there very accurately. I wore our 8.5 month old plus a backpack and my husband had a backpack and fishing gear and we were able to trek to and from the water pretty well. There were a few steep points getting down to water level, but it was worth it. We were able to stop and fish several times along the way. Several trails branches off this loop, so using the map is very helpful if you want to stay on course.

hiking
3 days ago

This is a nice trail for a morning's or afternoon's walk. It begins, a little curiously, on a dead-end suburban street (St. Johnsbury), but then you pick up an old and now discontinued street (Rockwell) that runs into the woods on the left. (One positive about this is you won't have trouble finding parking at the trailhead!) The stretch along the river is nice, but unless you go down and follow the riverbank itself, you are atop the 4-foot wide retaining wall of the old millrace which makes social distancing a bit of a challenge! There's a challenging but invigorating climb back up the slope from where you leave the river at the end (where's there's a nice view of the graceful Route 40 bridge). You can get the total length to 3.0 miles by walking down the millrace to the left when you first hit it until you reach the Park boundary at someone's house.

hiking
29 days ago

Easy straight forward loop

hiking
rocky
1 month ago

muddy
over grown
washed out
1 month ago

was very muddy, eroded, and in some parts overgrown, but that being said, it was very nice. really steep hills going both up and down. we went up a huge rocky hill at the end of the river and took a sharp right, got lost, and used Google maps to find our way back to the road. parking isn't horrible. note that trail markers are not clear.

hiking
2 months ago

This trail is great- but is now closed about 0.5 mile after the bridge. Seems like they’re doing construction? Haven’t found a way around it

hiking
muddy
3 months ago

hiking
muddy
scramble
4 months ago

Fun hike but dont think patapsco maintains this as a whole trail - so, for a while it’s very hard to navigate and the tree markings just stop. My outcome was much more mileage than what is listed here on AllTrails

hiking
icy
off trail
5 months ago

This trail had great views but was poorly marked with some hard areas.

muddy
6 months ago

beautiful along the river and good scenery overall. walked along in the fall and the further into the trail it becomes difficult to navigate, to be exact it's after the bridge. there's no markers so I relied on the map and directions without the premium subscription.

hiking
6 months ago

A walk Ben on a crisp fall day.

hiking
7 months ago

More like 3.5...Overall I really liked it, I am glad we did the loop clockwise as the trail going up from the river was steep with many leaves and loose dirt and going down would have been difficult. It was also unmarked at this point. I would try next time to follow the river a little further to the next trail going up and see if that’s better. Also on a fall day it was fine, but the narrow trail along river I could see possibly being too buggy or overgrown in the summer.

hiking
7 months ago

Dog friendly , good distance, quiet. Trails is poorly marked in some places, so I relied on the AllTrails map to guide me.

hiking
8 months ago

Nice trail that has several terrain changes - abuts the river for some great views and even an old ruin that now functions as a beautiful swimming area.

hiking
muddy
rocky
scramble
9 months ago

This trail was great! a lot of up and down with some challenging terrain and a nice river along half of it that you can wade into.

hiking
bugs
rocky
11 months ago

hiking
Sun Apr 14 2019

Not a bad trail, starts off high and flat, then goes down to the river, follows the river on an old elevated footpath. Then follows the river down to rt 40 bridge. You can follow the trail back which switchbacks up and out of the valley, or you can take a pretty intense, rocky hill climb straight up. Trail blazed with red paint.

hiking
rocky
Tue Mar 19 2019

The trail is in great condition. The first portion use to be a road; however, most of the pavement is now gone. The trail is nice and wide and easy to follow. It does narrow near the river. It wasn't very muddy.

hiking
muddy
rocky
Sun Mar 17 2019

Super fun trail ! Really muddy on the spur, but otherwise pretty dry and fun!

Sat Sep 22 2018

Great hike. Trail starts in a neighborhood. Runs along the river for large portions. Had son in carrier so it was the perfect difficulty level.

hiking
Sun Mar 04 2018

Good loop on a beautiful afternoon. Views of the river with the sparkling sun were photo worthy. The mill race was interesting to see. Next time I think I will go down stream to the mill. Saw hikers, runners, and a couple of bikers. It was not crowded. Trail in good shape.

hiking
Sat Mar 03 2018

We took the Patapsco-Thru Trail north to Route-40 Bridge, went under the bridge, connected with Pickall Trail, stayed along the Patasco River the whole time, then went under the I-70 Bridge, until reached the Hollifield Road Bridge. 4.1 miles long each way. The trail is easy to follow and fairly leveled. 1/3 mile of the trail south of Route-40 is on a paved road (Oella Ave). It took us 3 hours to complete the 8.2-mile out&back hike.

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