At times of increased/excessive flows in the river, it is likely there will be water flowing into a spillway from the dam which forms Lake Wissota. Just under a half-mile of gradient here appears to have potential interest for whitewater boating. (Aerial views show enough detail to suggest some significant features likely to form at good flows!)
The hydro facility can discharge a maximum of approximately 10,400 cubic feet persecond (cfs), so flows above that (and possibly at times below that!) will put water in the 'overflow' channel(s).
It appears there could be good access from 74th Avenue (parking at the dam, likely for fishermen) which could be used. One would most likely have to carry in, and carry back up and out (I.E., this is a 'park-and-play' section). However, a scouting report from Memorial Day Weekend, 2020 (thanks, Niko!) found access from 74th Avenue blocked by a fence and gate. If that gate is always closed/locked, it may mean access would only be via carry-up (0.5-0.75 miles) from 'Area 178' parking for off-road mountain biking trails. (parking LAT/LNG: 44.9449, -91.3541) A fine map of this area (and the trails) is available at:
https://corbatrails.org/wp-content/uploads/2019/08/Area178NativePlain20171029.pdf
For those of you who use Facebook, as I write this, there is a fine video shot by a biker from the adjacent biking trails. (Using the timestamp of the post, flows may have been in the neighborhood of 35,500 cfs on the USGS Dells Dam gauge.) Check out the video here:
Facebook CORBA Area 178
To reiterate, this will ONLY have water when inflow exceeds capacity/needs of the hydroplant. At all other times, expect this to be nothing but rocks and (likely) random pools of water! (Perhaps a good time to walk across to check out the middle channel and 'connecting' channel!)