Pond Boss Forums POND CONSTRUCTION Building a dam Opinions/advice on building a land bridge?

Talk to the NRCS to see what the 100 year flood projection is for that property to calculate gallons of water flow needed thru the bridge. That will give you some ideas on what sized culvert would be needed, and you can then figure out cost comparisons. It's better to have a culvert that is too big than to have the bridge wash away with all the vehicles at the house........