Slope/Tilt Guage

[MAC]

There is a big open space valley area near my home, with dense forest, steep hills, running stream crossing the narrow dirt road. The boys say there is a lake at the bottom of the valley just above the golf course, I've yet to find a boy who actually been there, but all said some others have. After a mile, the dirt road dips down sharply, so much so that one cannot walk down but do it on all four. I tried the road a couple times, but both times turned back or backed up the road at that point. I have no idea what degrees that slope is, except it looks pretty scary. I would think a tilt or climb meter might help me out there.