Pond spillway fish gates?

What is the best way to make fish gates to protect fish from leaving my pond thru spillway at large flooding rains. My spillway is about 4 feet wide, I am planning widening it to about 10-12 feet wide.  Where would a guy find plans for this. Any help appreciated.Thanks, Tracy

Saw several different varieties working at the Nuke.

Simplest was a semi floating Weir Gate, has the appearance of a Sickle bar standing on edge was locked into a pair of uprights and the float attached to it kept the Vs of the over spill where needed to be. To allow more flow we would block that in place and allow water to either overflow heavily or use for a gate and stop flow or if liquid level lowered enough would just hang in limbo.
Another was a series of vertical metal bars like a walk grate, a narrow distance apart but of flow became fast enough would trap critter or debris against them.

Edited by DMiller - 09 May 2024 at 10:04am

There is a pond near me at a state recreation area where the pond uses a vertical tube which terminates at the desired normal water level. As water levels rise, the overflow goes over the top of the tube such as you would see at dam and take some of the floating debris as well. Unless your fish are jumpers this may work?

What species of fish are we talking here? Blue Gills and Crappies? Or Muskelunge and Garr?

Tracy, were the Koi reproducing in the pond?  I haven't put the likes in my pond for fear of over population.

We used hardware cloth. It kills a few smaller fish if the current running thru the spillway is very strong.