Kraemer Boulevard Undercrossing
This vehicle undercrossing project was part of the Orange County Bridges Program to separate the Burlington Northern Santa Fe (BNSF) rail line from local streets at seven locations. Atkinson lowered the entire intersections of Kraemer Boulevard and Crowther Avenue and constructed a one-million-pound structural steel underpass bridge to allow BNSF rail traffic to pass over local traffic. Atkinson built temporary shoofly tracks south of the current track alignment to maintain BNSF rail traffic during construction of the railroad bridge, retaining walls, and roadway. Once the intersection was completed, rail traffic shifted onto the new mainline bridge.
To lower Kraemer Boulevard and Crowther Avenue by approximately 25 feet, the project team performed 130,000 cubic yards of excavation and built cast-in-place and secant pile retaining walls using 4,000 cubic yards of structural concrete and 31,000 LF of concrete piling. The scope of work also included landscaping, architectural improvements to the retaining walls, construction of a new pump station to control groundwater, and 30,000 square feet of sound walls. Atkinson also relocated and installed 5,200 LF of stormwater and 5,800 LF of sanitary sewer lines.
The project team worked under noise and vibration restrictions and closed the intersection for a substantial period during the construction phase. Upon completion, cars now move unrestricted under the railroad tracks—enhancing safety and increasing mobility.