Whitnall Park Creek - 116th and Janesville Road to S.92nd Street (0.72 mi.) (WI)
Approximate - nearest available gauge. Use as general reference only.
Almost immediately after passing under Forest Home Avenue (the last of four bridges in quick succession), a concrete structure (likely a utility conduit) has a smooth top and sloping face, acting as a small dam, creating a very uniform hydraulic.
This should be scouted from the parking lot at Jetz gas station (where there is also a Culvers, and a Subway) before putting on anywhere upstream.
It is possible that (at some ideal flow) there could be some play possible here, however: (1) there's not likely to be much of an eddy for repeat play, and (2) at least as often you will just need to 'punch' it to keep from being recirculated in the hydraulic.
Also note: nearly 3/4ths the width of this conduit/dam has coarse cement extending horizontal off the base, missing only from the left-of-center quarter. Thus, running just left of center may avoid a piton onto or scrape across these slabs.
Waterfall
III+
Waterfall
III+