Twinwall plastic is the complete answer for this sort of application. I installed 4 culverts for crossing points across deep ditches on my marsh last spring. As long as you have at least one diameter of pipe thickness of fill above it (i.e. 3 feet of fill for a 36" pipe) they will stand terrific loads. In one smaller ditch I put an 18" pipe & only about 6" fill over it & there is zero deformation while driving over it with 2 tons of tractor plus about 1 ton .
In UK they come in 20 ft lengths with separate couplers.
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Today's Featured Article - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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