Request For Proposals

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BRIDGE 23C0092 ON STEVENSON BRIDGE ROAD AT PUTAH CREEK
BRIDGE REHABILITATION DESIGN

DUE BY FEBRUARY 19, 2016

The County of Solano, in conjunction with the County of Yolo, the California Department of Transportation (Caltrans), and the Federal Highway Administration (FHWA), is proposing to rehabilitate Stevenson Bridge crossing Putah Creek. Stevenson Bridge (23C0092) at Putah Creek was constructed in 1923. The existing bridge is an arterial structure that provides access for approximately 900 vehicles per day between Solano and Yolo counties. Stevenson Bridge is comprised of reinforced concrete T-beam approach spans and concrete tied arch main spans. The bridge structure is 296 feet long and 24 feet wide with two 40-foot approach spans and two 108-foot tied arch main spans. The substructure is supported on reinforced concrete piers with curtain walls, founded on a timber pile foundation.

Stevenson Bridge has been identified by Caltrans as both functionally obsolete and structurally deficient. The functionally obsolete rating is based on the existing 20-foot deck width, compared to current standards of 28 feet. The structurally deficient rating was assigned mainly due to existing delaminated concrete on the bridge deck and the tight curve radius of the south roadway approach. Additional major issues include spalled or delaminated concrete and exposed reinforcing steel bar, flexural cracks in both approach spans, and failure of the retaining wall at Pier 1.

The area above the northeast creek bank between County Road 95A and the access road will be used as a staging area. General bridge construction equipment to be used includes, but is not limited to, haul trucks, backhoes, dump trucks, excavators, grade-alls, bulldozers, drilling equipment, water trucks, concrete delivery trucks, and service vehicles.

Seismic assessment of the bridge showed that many of the existing structural components of the bridge are unable to withstand seismic loads without retrofitting. Flexural and shear demands exceed the corresponding capacities, requiring retrofit or replacement of several structural members in order to meet safety requirements. Deficient components include the bridge railing, deck spalling and carbonation, deck drains, cracking of approach spans, and substandard south approach alignment. In addition, the Hydraulic Analysis determined the structure is scour critical and scour mitigation will be required to maintain the structural integrity of the bridge.

The existing bridge is proposed for rehabilitation and retrofitting in accordance with the Federal Highway Administration (FHWA) guidelines under the Highway Bridge Program (HBP). The rehabilitation work will maintain the historical architectural features while extending the life of the structure between 50 and 75 years.

Road closure will be required during road construction and bridge rehabilitation work. Traffic will be detoured using a loop along Stevenson Bridge Road, Sievers Road, Pedrick Road, Russell Boulevard, and Road 95A, with a maximum length of 13.7 miles.

Solano County Resource Management Department - Public Works Engineering, (County) is seeking proposals for professional engineering services for this bridge rehabilitation project.

Complete RFP        Feasibility Study        Field Review        FOE/SOIS