Petapawg, Towhee, Harry's and Tri-Town Loop

EASY 36 reviews

Petapawg, Towhee, Harry's and Tri-Town Loop is a 3.7 mile moderately trafficked loop trail located near Sudbury, Massachusetts that features a lake and is good for all skill levels. The trail offers a number of activity options and is accessible year-round. Horses are also able to use this trail.

3.7 miles
91 feet

kid friendly


cross country skiing



horseback riding

mountain biking

nature trips

paddle sports


trail running






no dogs

The Assabet River refuge comprises over 2,333 acres of varied woodland, wetland, fields, ponds and streams, with historical and archeological sites. The Assabet River refuge comprises over 2,333 acres of varied woodland, wetland, fields, ponds and streams, with historical and archeological sites. It is divided into a 1,900-acre northern section, a 300-acre southern section, and 91 acres scattered along the Assabet River in Stow. The terrain is primarily flat but includes some prominent hills; elevations range from 170 feet near the river to 320 feet on Walnut Hill. Seventy percent of the refuge is forested with pine, oak and maple. There are over 470 acres of diverse wetland habitat including an Atlantic white cedar swamp. This jewel is connected to about 1,000 acres of other diverse protected space. The Refuge is open year round from one half hour before sunrise to one half hour after sunset. Wildlife-dependent recreation opportunities, including hiking, photography, interpretation, and environmental education, are permitted on designated trails shown on the refuge map. Note that the trail system in the refugue was reworked in spring 2007.

1 month ago

There's much more than 3.7 miles of trails here (I regularly do 4.5-8 mile loops here) AND you can connect with other nearby trail systems. Great place for short or long easy hikes/walks, bird watching, bike rides, snowshoeing, cross country skiing, hunting, fishing, and looking for tracks. Most trails are either flat dirt trails, partially paved old roads, or you can just walk the sidewalk if you have strollers or unsteady-when-standing individuals with you.

ARNWR was once a part of Fort Devens/Maynard ordinance depot and the historic ammo bunkers are still standing. The visitor center is open from 10a-4pm on weekends and is a great place to check out (especially with kids)!

Fair warnings:
This is a great find for locals & new hikers/outdoor enthusiasts BUT if you're looking for a physical challenge, you won't find it here.

The refuge boasts a large wetland and while this is ideal for wildlife viewing, during the summer it can get VERY buggy on the trails.

Dogs are not allowed on the refuge.

3 months ago

We loved this, great visitor center (where we starred)!beautiful lake, interesting military structures, we extended our walk and went to the river and loved what we saw- the rail trail, pretty bridge over the river and some side marshes. The last half of the walk was nondescript but wrapped up a great 3 hour walk

4 months ago

To be honest trails are flat and fairly boring . The main trail is paved . I think would be a better biking trail than hiking trail . Several old ammo bunkers on trails . Putter Pond is nice but mainly uninteresting.

4 months ago

Great trails, beautiful foliage views. Several raptors, waterfowl, warblers.

4 months ago

Great walk. flat and shaded

road biking
6 months ago

The loop is one of the most unique trails I've hiked. There are 7 or 8 massive concrete bunkers along the trail giving it an interesting historical element. There is a little side trail that takes you to a beautiful lake as well. The hiking is very easy and good for all levels of experience. Definitely add this to the to-do list.

6 months ago

9/1/17 Harry's Trail -> Towee -> Petapawag -> Powerline Trail -> Visitor Center lot. Nice walk/hike. Very few bugs.

trail running
7 months ago

Pretty trail, wide and flat looping around ponds/marsh. Saw two egrets, but the bugs were really too awful to enjoy the trail on a day early August.

8 months ago

Pleasant, very easy walk mostly on old dirt/gravel roads through varied forest and wetlands. Along the way you'll pass over a dozen Army ammunition bunkers from World War II. Take the short Kingfisher Trail to a beautiful pond.

Wednesday, March 01, 2017

half dirt, half road, if you're adventurous there is an abandoned air force base about 500 feet northwest of the where it says Assabet River National Wildlife Refuge on the map (its right in that little bend that looks like a nose in the Patrol Path), and its pretty cool. Closer walk to base if you park on the northwest side in Maynard and walk in southeast or if you want the fun river and woods paths you park in Subury at the 1st (for road/woods path and 2nd parkinglot (further in) (if you want more woods and some swamp/lake paths.)

Sunday, January 08, 2017

Beautiful with varied habitats. Saw sharp shinned hawk, buffleheads, and a heron rookery.

Tuesday, November 22, 2016

Nice trails with intersections well marked but oddly none of the maps says "you are here" and provided paper maps are unreadable.

Wednesday, October 19, 2016

nice wide flat trail. peaceful.

Sunday, May 22, 2016

Peaceful hike, enjoyable paths, clean, quiet, very relaxing.

Stay away, I'd like to keep it for myself.

Sunday, May 01, 2016

It's was a great flat hike. Wide trails, marked well, hard to get lost. I did 7 miles, enjoyed the wildlife and peace. Next time I will bike it!

Friday, April 29, 2016

It was an easy hike. I did a 6.2 mile loop. Which pretty much covered all the hiking trails in the park. Some of the sceneries along the trail were beautiful.

Saturday, April 09, 2016

nice area for turtles, fish, and chipmunks

Sunday, January 31, 2016


Sunday, May 17, 2015

Soooooo many mosquitoes

Monday, April 27, 2015

I really like this place as it's one of the few spots within reasonable driving distance from the city where you can't hear any roads or highways. There are plenty of trails and a lake. You can make your hike anywhere from 2 to 10+ miles long. Keep in mind that the northern section (north of White Pond Road) is closed to hiking.

The trails are wide and mountain biking is allowed on most. There's plenty of wildlife to be seen if you stay still for a few minutes. There are 50 munitions bunker dating to WWII present in the refuge. Some may find these a bit creepy, especially on an overcast day, but I think they're a surreal glimpse into history.

1 month ago

3 months ago

10 months ago

Sunday, February 19, 2017

Saturday, February 18, 2017

Saturday, July 23, 2016

Saturday, June 11, 2016

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