Yes! We try to get there once a year whle the water is warm.
The site is on a point (clever huh?) where the prevailaing wind drive a current. This keeps the first 20 feet or so largely free of slit and more stony. Many sections are loaded with boulders and fish. If you head out and know where to go you can find some real depth. Tech diver types frequently go there to practice. When we go we try to make two dives, one to the left and one to the right.
The location is a actually McKinny (SP?) park. It's at the end of the Clark road across form the hospital. (43.572004,-71.211075) This is just NW of E. Clark road so don't get suckered into that little loop. Perhaps 3/4 of a mile down from the main drag. It's at the bottom of the hill where the pavement makes a hard left turn. The parking there has frontage for 2 or 3 vehicles. If you are a group you can get 2 deep. There is additional on street parking in the residential neighborhood. I have never turned away for lack of parking. On weekend mornings it can be hopping with students and you may be up the street a little.
You get organized up near your car or at some adjacent picnic tables. There is then a random stone stair climb down to the area near the water. We usually prepare our gear and pack the heavy stuff down while in street clotes for a good fitting. The change, go down, gear up and splash. (Think 1000 steps north) There is one table down below. You may want a tarp to keep you stuff off the dirt.
Entry is made by carefully stepping between some rocks and in a few step you are waist-to chest deep water to don fins.
With your knife you can open fresh water clams and befriend the fish.
This is New Hampshire, you must have a flag with you. The Marine Patrol is active on the lake and will fine.
It's a definite option when the ocean is rocking. However if it's windy everywhere it's a big lake ant it can get rough there too.
Pete