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3151 Airway Avenue, Suite T-1
Costa Mesa, CA 92626




I-710/Firestone Boulevard Interchange Reconstruction

South Gate, CA

Client: City of South Gate


I-710 Firestone Boulevard 1   I-710 Firestone Boulevard 2


The City of South Gate desired to make improvements at the I-710 Firestone Boulevard Interchange due to lengthy delays and congestion. The staff of Civil Works Engineers preparation a feasibility study to identify potential improvement scenarios. After that, the City again hired the staff of Civil Works to prepare the Project Study Report and Project Report for Phases 1 through 4 and the PS&E and construction services for Phase 1. Numerous geometric alternatives were developed and it was determined the most efficient configuration would be to reconstruct the full cloverleaf interchange to a partial cloverleaf. Due to limitations in funding and prioritizing immediate needs, the reconstruction/reconfiguration was proposed through a phased approach. Ultimately, the entire interchange would be reconstructed including all ramps realigned and reconfigured, street widening, Los Angeles River and Rio Hondo bridge widening, overcrossing replacement, box channel extension, coordination with 
LADWP regarding transmission towers, waterline relocation, right-of-way acquisition, hazardous waste (petroleum hydrocarbon and lead) construction mitigation, successful applications for federal and MTA funding, and preparation of Requests for Authorization forms through Local Assistance resulting in obtaining the E76. Total 
construction cost is estimated over $40 million.

After the construction of Phase 1, reconstruction of the southbound off-ramp and widening the north side of the LA River bridge, the City hired the staff of CWE to perform City project management for Phases 2 and 3. Phase 2 was the reconstruction of the northbound off-ramp. Phase 3 was the widening of the Rio Hondo Channel bridge and approach roadway and median. As part of this assignment, we were responsible for assisting City with design consultant selection, monitoring design progress, coordination with agencies, coordination with right-of-way and hazardous waste issues progress, and assistance with peer review consultant selection. Prepared successful application for HBRR funding ($5.412m HBRR funds) including bridge widening, deck replacement, roadway approach improvements, painting, barrier rail improvements, and seismic retrofit. Also prepared Request for Authorization for obligation of funds through Caltrans for HBRR funds and Letter of Agreement for MTA Proposition C funds.


We prepared a successful application for HBRR funding ($4.321 m HBRR) including bridge widening, deck rehabilitation, roadway approach, and barrier rail improvements. Also prepared Request for Authorization and Finance Letter for obligation of funds through Caltrans for HBRR funds and Letter of Agreement for MTA Proposition C funds. Assisted City with paperwork required to convert RSTP fund to Proposition C. 

Currently on Phase 4A of the project, CWE is working as a subconsultant to PBS&J for the PS&E. This phase includes the widening of the south side of the Los Angeles River Bridge Widening and realignment of the eastbound to southbound on-ramp to I-710. We are preparing the supplemental PR, storm water data report, and drainage plans. 


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