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.