NV5 - North Milliken Grade Separation

North Milliken Avenue Grade Separation

The North Milliken Avenue Union Pacific Railroad (UPRR) Grade Separation Project replaced the existing at-grade crossing by constructing a 170-foot long, two span, steel plate girder underpass at Milliken Avenue between Airport Drive and Guasti Road in the City of Ontario, California, elevating the UPRR tracks approximately 30 feet above the existing grade crossing.

Other improvements include nearly 360,000 SF of T-WALL®, widening and reconstruction of Milliken Avenue between Airport Drive and Guasti Road, construction of curb and gutter, sidewalks, raised median islands, street lighting, traffic signal modifications at the intersections, traffic signing and striping, and landscaping.

One major feature of the project is construction of a new underpass and approximately 6,000 linear feet of embankment fill with gravity-type retaining systems using T-WALL® precast concrete units.


Ontario, CA


San Bernadino Associated Governments


Civil Program Management