Almost certainly too low to boat.
Downstream of our recommended take-out, the creek approaches the WE Energies Port Washington Powerplant. The creek to splits here (at least at times of higher flows).
The (more-or-less) historic channel heads to the left, and is quite narrow and filled with cattails and shrubbery, making passage difficult-to-impossible. In addition, prior to the confluence with Sauk Creek, there are very low-slung horizontal pipes spanning the creek at a height which would likely preclude any safe passage.
THEREFORE, DO NOT TAKE THE LEFT CHANNEL!
The second alternative (from the split) would be to the right. An overflow channel allows peak flows to spill over a cement wall into a channel which passes south of the WE Energies powerplant (where all property is posted against 'Unauthorized Personnel'). Railings on that wall block dropping into the channel below. Rocky rubble lines the whole channel down to the lake. Having enough water to make this channel anything close to boatable is likely to be far too much water to make the bash-and-crash (down the narrow, strainer-and-sweeper filled main portion of the run) anything close to sane or do-able!
For this reason, it is virtually mandatory to exit the creek before this point!
If interested, you should be able to do a 'virtual scout' of this area if you go to Google.com/maps, search for "Port Washington", and zoom into this area.
Waterfall
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Rapid
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Rapid
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Waterfall
II