John Q Adams wrote:
...
After the 8 lessons, a last graduation session for each class
4 instructors took the students down the South Fork of the Sacramento
on the "Gorge" run, a low class 3.

Just in case anybody tried to run the S Fork of the Sacramento thinking
it is a class 3 run, I think John meant the South Fork of the American.
The S Fork of the Sacramento starts out class 5, then eases up to class 3
(but continuous) as it emerges from a bedrock gorge onto boulder fields
about 5-6 miles above Siskyou reservoir.