Likely low to moderate. (Best flows uncertain! Please help your fellow boaters by adding a comment about best flows, and class/difficulty at various flows!)
The Put In rapid marks the beginning of the Flambeau's South Fork section, offering paddlers an initial sense of the river's character and flow. While specifics about its precise difficulty are unclear from available data, the entry point likely requires careful navigation through potential initial obstacles or current complexities that set the tone for the downstream journey.