Cornerstone designed the new 55 foot, two-cell box concrete box culvert and retaining walls.  The project required a design that allowed access to the Fresno Irrigation District’s canal access roads on both sides of the canal.  Cornerstone worked closely with FID to incorporate FID’s standard details for slope paving, board guides, and trash protection into the new culvert, as well as maintaining a minimum channel flow of 350 cfs during construction.