wisconsin has roughly 15,000 lakes (that's right, suck it minnesota)
there has to be one near you that you can build a water ramp at like the guys did in the pictures above.
i'm from se wisco, and i can think of a few within 20 min. of my parent's house that would work not counting private ponds and lakes on friend's property.
try to find something like that. it will be much more fruitful than looking for an indoor place.
you'd probably just need a pump and a hose for that, right?
Wisconsin professes to have 15,081 lakes.
However, 9,037 of these lakes are unnamed and average only roughly four acres in size, leaving only 6044 that are large enough to be named.
In contrast, Minnesota has 11,842 named lakes larger than ten acres.
When including unnamed lakes over ten acres the number is 15,291. Various estimates propose that if Minnesota were to lower its cut-off threshold to five acres the number could approach or exceed 20,000 lakes.
In addition, when considering the surface area of each of the states five largest lakes (great lakes excluded), Wisconsin's largest cover 204,105 acres whereas Minnesota's top five total 896,387. Add to that the fact that the surface area of Minnesota's largest eight lakes is greater than all 15,081 "lakes" in Wisconsin. Minnesota also possesses more shoreline than California, Florida, and Hawaii combined.
oooo the power of google
either way, minnesota still sucks.
google that. i bet you get lots of results.