This is an old quarry. The tallest face is about 14 feet, slightly overhanging (although the photo makes it look slabby). It's shady with a steep base that would make crash pads impractical. I haven't climbed it yet and don't know if anyone else has. It doesn't look like something you'd travel for, but it might something for locals to try.
It's 1/4 mile south of the Tyngsboro Bridge on Middlesex Rd. It's the first hill after some stores on the right. There's a dirt parking area just before the bend in the road that's right at the base of the hill.
Climb up a short wall below a rock horn, topping out to the right of a small tree. The route has several large ledges and jugs which make it pretty easy but fun. The rock quality is very nice; too bad there's not more of it....[more]Browse More Classics in MA
This reminds me a little bit of the quarries off of Ridge Rd / High St just over the MA border from Nashua. I remember in high school going out there with cases of beer, having giant bonfires, and jumping off the 35ft ledge. I walked back out there recently to look at the walls with a climber's eye: the walls are pretty flat, relatively short, and have shitty (or no) stances below. The standing water is a lot grosser than I recall, so I wouldn't want to boulder above it. There's nasty jutting rocks along the edge as well - I'm surprised we never got ourselves into trouble growing up.
I only saw two routes which did not look too dangerous. The rest of the wall looked cracked and broken up; too risky for my tastes. I tried one route which was easy and fun. The other one, not in any photos, looked very solid and smooth but also very tough - just a few thin holds and slightly overhung. If you attempt that one you'll probably want a top rope. There are plenty of trees, just make sure they're rooted solidly.