Green Lake National Fish Hatchery, Ellsworth

It would be really interesting to get a tour of this facility, which raises eight strains of Atlantic salmon. It’s been hatching fish since 1974, which it stocks mainly in the Penobscot River, with the goal of preventing the extinction of the species, preserving its genetic diversity and, ideally, restoring “self-sustaining fish populations that no longer need to be supplemented with fish produced at the hatchery.”

You can get a good look at this place because it welcomes walkers and has a well-established 1.3-mile trail on its southern side.

From the trailhead at the driveway entrance, you can head onto the path, well marked with green blazes, for a 1.3-mile walk through the woods to the lake. (In about 0.5 miles, you’ll come to an intersection with a short trail that leads to the manmade fish ponds.) When you get to the power line, which the trail crosses, look for the rock cairns that mark the twisty path. There’s no beach at the end, but there is a bench by the water with an interpretive sign about the decline of our native fish and the need for conservation hatcheries.

Then you can walk the 0.6 miles back along the paved road, which is a much easier route to the lake! (The woodland trail is rocky and rooty, like so many Maine paths.)

Directions: The address is 1 Hatchery Way in Ellsworth. From Ellsworth, drive north on Route 1A to junction of 1A and Route 180. Turn right onto Route 180 and travel 4.25 miles to Hatchery Way on the left. Park at the gate. There’s plenty of places to pull over either side.