Ralph Hill Park Trails is a 2 mile moderately trafficked loop trail located near North Billerica, MA that features a river and is good for all skill levels. The trail offers a number of activity options and is accessible year-round. Dogs are also able to use this trail but must be kept on leash.
dogs on leash
The trails are well marked and the Sudbury Valley Trustees do a good job of trail maintenance. There are some trees across the trails, bikers need to beware of these obstacles. The walking is great, some up and down hill, but not difficult at all. There are several different loops you can do depending on how far you want to go. You can see the river, but the edge is mucky.