We are trying to do some maintenance in the river in Steamboat. Wonder if any other parks have gotten push back from Army Corps regarding the use of grout in the river. Feel free to PM me.
You never place grout when it can come in contact with live river. You place grout in a isolated work area, inside of a coffer dam. Once it cures its inert.Uncured cement can be bad for fish. I have seen fresh concrete in contact with the water kill all of the trout in a small creek.