New Sustainable Improvements Modernize SR 99 In South Stockton

Stockton, CA…Caltrans and its partners, the San Joaquin Council of Governments (SJCOG), San Joaquin County and the city of Stockton, celebrated today the completion of a $214 million project designed to decrease congestion and improve commute times for motorists traveling on State Route 99 through South Stockton.



State Route 99 at Mariposa Road Interchange. The project widened a four-mile stretch of SR-99 from four to six lanes between the Crosstown Freeway and Arch Road. Crews also constructed a new interchange at Golden Gate Avenue; converted the Dr. Martin Luther King Jr. Boulevard Interchange to a two-way overcrossing; modernized the Main Street overcrossing; replaced the Mariposa Road Interchange to a full service interchange with new on and off-ramps, and sidewalks for pedestrians. In addition, a Park & Ride facility was constructed with approximately 90 new parking spots.

“SR-99 is one of the busiest transportation routes in San Joaquin County,” said Caltrans Director Malcolm Dougherty. “These improvements will ease traffic congestion and provide motorists with a smoother commute. We encourage commuters to use the new Park & Ride facility and take advantage of transit and carpooling to help reduce greenhouse gas emissions.”

“The completion of the South Stockton SR-99 widening is just one of the continuing partnership efforts between Caltrans and the San Joaquin Council of Governments to modernize Highway 99 — the workhorse of the California state highway system,” said SJCOG Executive Director Andrew Chesley.

The project received approximately $132 million from Proposition 1B, a 2006 voter-approved transportation bond. To date, approximately $19.2 billion in Proposition 1B funds have been distributed statewide. The project also received $47.5 million from SJCOG’s Measure K.

With this project and the SR-99 Manteca Widening Project, Caltrans and its local partners have now widened 14 miles of SR-99 from SR-4 to Austin Road.