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Question DetailsAsked on 7/29/2015

replace culverts in driveway with a bridge

driveway is dirt and gravel

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Assuming you only have a couple or a few culverts so less than about an 8-10 foot span, there is a much cheaper solution (almost always) than a bridge - having a driveway or excavation contractor put in a prefabricated reinforced concrete box culvert - basically an open-end concrete box that is plant-cast, then transported to your site on a trailer and set in place with the same backhoe that excavates the existing culvert and road fill.

Be sure to get proper permit from local road or drainage department/district (as applicable for your area) so it meets their requirements for setback from edge of road, height (street end generally has to sit 2-4 inches BELOW street surface in snowplowed areas), required invert (bottom) elevation and cross-sectional area for flow capacity, etc.

And in setting it pay attention to whether it needs to go a bit deeper than needed now if it will someday get paving over it if you ever pave your drive.

Answered 3 years ago by LCD

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