It depends on where the new fish fence is located. If it is located above Willow Springs, where there is a natural spillway for water to move from the DesPlaines River to the Sanitary and Ship Canal above (closer to Chicago than) the proposed locations in Romeoville, then it will work. If it is at the location in Romeoville near where the existing one is, then during the spring rains it is possible for fish to get from that river into the san and ship canal and avoid the fish fence.

Recall, also, that there are two non-navigatable waterways going from the river system where these fish are located to Lake Michigan. That means that these waterways are not controlled by the Army Corps of Engineers and beyond the scope of any control measurescurrently under discussion to the best of my knowledge.

Also, they have already been reported in Lake Erie per newspaper reports.

I agree that they need to be slowed/stopped. But maybe netting them and using them for fish burgers/export to where they are currently eaten/made into fertilizer may be a viable alternative or corrective measure as well.