The Interstate 80 (I-80) corridor between Omaha, NE and Lincoln, NE is currently undergoing several phases of reconstruction that includes road widening, new bridge overpasses, and new exit and entrance ramps. Several features and obstacles along the interstate prevent typical embankment and road construction. West of Exit 426 (Mahoney State Park exit) there is a 120 feet long, 10 feet wide, and 10 feet high concrete box culvert that extends beneath the entire width of the eastbound and westbound lanes of the interstate. The box culvert was constructed in 1975. One end of the box culvert had to be extended 12 feet to allow for embankment construction to support the proposed road widening and reconstruction of an entrance ramp. A retaining wall was needed at the end of the existing culvert to allow removal of the culvert wing walls and to support the temporarily oversteepened slope of the interstate embankment.
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