Caltrans has secured a $73 million grant from the California Transportation Commission to begin widening a congested stretch of Highway 37 between Sears Point and Mare Island, a corridor used by 47,000 drivers daily. This marks the first major funding milestone toward the estimated $500 million expansion project.

Highway 37 east of 101 in Novato, Calif., on Wednesday, September 13, 2017. Caltrans got $73 million to widen Highway 37, but critics warn rising tides could flood the corridor by 2050

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What the Project Includes

- The initial phase will expand eastbound lanes, converting one to a tolled express lane and designating the existing one as a carpool lane.

- A bridge west of Highway 121 is set for replacement, and Phase II, projected to cost $251 million, should wrap up by late 2029.

- A future $10 billion elevation and complete rebuild is planned to protect against sea-level rise.

Flood Concerns & Climate Criticism

Critics note that rising sea levels may inundate parts of Highway 37 by 2050, casting doubt on the project’s long-term efficacy. Environmental groups argue that allocating funds toward an interim fix is “an irresponsible investment into a highway project that will literally be underwater”.

However, Caltrans counters that the current expansion targets higher ground less vulnerable to sea-level rise, allowing the community to benefit in the short term. The long-term elevation project is expected to address remaining flood risks.

Evaluating the Broader Impact

Looking Ahead

This funding moves the Highway 37 project into its active phase—but not without controversy. Supporters spotlight the potential commute improvements and social equity gains, while detractors push for investments in long-term, climate-resilient transit strategies and public transportation.

Ultimately, whether this represents a responsible interim solution or a misguided investment depends on California’s broader commitment to sustainable infrastructure.

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