Don't dream of doing this in Canada.
Conservation forces will ding you on a charge called 'altering a water course'.
You pay a penalty, and pay to remove what you have built, and pay to attempt to restore what was impacted by what you did, often for more than 10 years.
And in Canada if you did dare to do this, you need to account for spring thaw and the huge volume of water and ice floes that happen at that time.
And that is no trivial hydraulic design exercise. It is what you need to do to keep everything you built from washing downstream.
Then you pay for the damage the water surge causes when your impoundment fails on top of all else. .