Gauge Description:

Much of the flow for BSF comes from New River which drains the Cumberland Mountains north of Oak Ridge and Clinton, Tennessee. When hard rains hit that area, look for BSF to be running the next day.

When running shuttle to the Leatherwood Ford take-out, there is an electronic gage in the gazebo that you can checkout for the latest flow information.

Several of the rapids get more difficult at levels below 1,000 cfs such as Double Drop, Washing Machine, The Ell, and others while large wave-trains form at around 3,000 cfs.
This run has even been paddled at levels above 10,000 cfs. I know of one group who ran it at around 50,000 cfs. Just remember that the river changes character considerably at these higher levels and a swim could potentially be long and very dangerous.