Welcome to the forum! I've had a long day and can't figure out what a LLO is. Can you elaborate?

You could have a company put in a coffer dam around the rotted culvert, replace it, then pull the coffer dam. I have no experience sleeving something that big.


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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).