Almost certainly too low. Help your fellow boaters! We need input to fine-tune boatable levels. Add a comment or report!
Almost certainly too low for whitewater run. (We need your input! Add a report to help define/refine these ranges.)
Likely too low for reasonable whitewater trip. (We need your input to help refine ranges here! Add a comment or report about recommended flows!)
USGS lists a site at S.Boundary Road citing drainage at that point as 358 square miles, or ~1.8*Black at its gauge.