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Typically, costs for installing a concrete access ramp fall between $1432 and $2377 and will vary with the size and features of construction as well as with your choice of finishes and landscaping elements.
Well Bob I guess you are correct. I just got an e-mail back from a company & it looks like they build a private boat ramp somewhat the same way as you describe. The cost for a 10' x 25' x 6 thick 3000 PSI reinforced concrete ramp would be approximately $ 4,293.00.