Roaring Brook

Here is a correlation of Roaring Brook levels vs Salmon levels I plagiarised from Jim Michaud:

600 cfs = 1.0 ft. Bone Run

800 cfs = 1.5 ft.

1000 cfs = 2.0 ft. Good Level.

1500 cfs = 2.5 ft.

2300 cfs = 3.0 ft.

It's not always accurate, but it does give you an idea. I've run it as low as 1', but I wouldn't recommend anything below 1.5' (a good first timer level).