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Residents and developers clash over Temescal Canyon interchange studies and proposed warehouse project

Riverside County Board of Supervisors · December 16, 2025
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Summary

Riverside County approved technical studies and early-phase funding requests to advance Temescal Canyon/I‑15 interchange improvements despite heated public opposition centered on a proposed 6.3 million sq. ft. Serrano Commerce Center and worries about truck traffic, pollution and local impacts; staff said studies are needed regardless of the developer’s project.

The Riverside County Board of Supervisors approved staff recommendations to move forward with planning studies and preliminary funding for interchange improvements at Temescal Canyon and Interstate 15, after a robust public hearing in which residents raised health, traffic and planning objections tied to the proposed Serrano Commerce Center warehouse development.

What transpired: County staff presented requests tied to Transportation Uniform Mitigation Fee (TUMF) administration and a project study report (PSR) that would fund initial design and coordination with Caltrans on ramp and interchange improvements. Staff…

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