Traffic Advisory San Joaquin County 02/27/26

State Route 4 - Lane & Ramp Closures
Long-Term One-Way Traffic Control At Old River Bridge

San Joaquin County- The California Department of Transportation (Caltrans) will perform various closures on State Route 4 (SR-4) for maintenance and construction work within San Joaquin County. Work will occur as follows:

• • Long-term, 24-hour, one-way traffic control will be implemented on SR-4 at the Old River Bridge for construction through November 2026.
• • Vehicles measuring over 34 feet in length are strongly recommended to seek alternate routes. SR-12 or Interstate 205 are highway alternatives between Discovery Bay and Stockton.
• Overnight, full on-ramp closures from Filbert Street to westbound SR-4/Crosstown Freeway for drainage work beginning Monday, March 2, through Friday, March 6, from 7:00 p.m. until 5:00 a.m.

Interstate 5 - Lane & Ramp Closures
Closures From Lathrop Road To Sacramento County Line

San Joaquin County- The California Department of Transportation (Caltrans) will perform various closures on Interstate 5 (I-5) for maintenance and construction work within San Joaquin County. Work will occur as follows:

• Full off-ramp closure from northbound I-5 at Lathrop Road for traffic signal work on Tuesday, March 3, from 9:00 a.m. until 2:00 p.m.
• Overnight, alternating lane closures on northbound and southbound I-5 from Hammer Lane to the San Joaquin/Sacramento County line for construction beginning Sunday, March 1, through Sunday, March 8, from 9:00 p.m. until 5:00 a.m. (northbound) and from 9:00 p.m. until 6:00 a.m. (southbound).
• Overnight, alternating full on and off-ramp closures at Hammer Lane, Eight Mile Road, SR-12 (Flag City), Turner Road, Peltier Road, and Walnut Grove/Thornton Road for construction beginning Sunday, March 1, through Sunday, March 8, from 9:00 p.m. until 5:00 a.m. (northbound) and from 9:00 p.m. until 6:00 a.m. (southbound).

The above listed lane and ramp closures on I-5 between Hammer Lane and the San Joaquin/Sacramento County line are required as part of the I-5 Anchor Pavement Project that will improve 34 miles of existing pavement and shoulders from Hammer Lane in Stockton to the San Joaquin/Sacramento County line. The project will also replace on- and off-ramps with upgraded concrete at Eight Mile Road, State Route 12, Turner Road, Peltier Road, and Thornton Road/Walnut Grove Road. For project details visit https://dot.ca.gov/caltrans-near-me/district-10/district-10-current-projects/10-1e300.

State Route 99 - Lane Closures
Overnight Lane Closures For Construction In Manteca

San Joaquin County- The California Department of Transportation (Caltrans) will perform various closures on State Route 99 (SR-99) for maintenance and construction work within San Joaquin County. Work will occur as follows:

• Overnight, alternating lane closures on SR-99 from Jack Tone Road to SR-120/Manteca Bypass for bridge work beginning Sunday, March 1, through Friday, March 6, from 8:00 p.m. until 4:00 a.m. (northbound) and from 9:00 p.m. until 6:00 a.m. (southbound.)
• • For any required detours and more information on this San Joaquin Council of Governments-led, SR-120/99 Interchange Improvement project, please visit https://www.sjcog.org/677/ABOUT.
• Full on and off-ramp closures on southbound SR-99 at SR-88/Waterloo Road for traffic signal work on Tuesday, March 3, from 9:00 a.m. until 2:00 p.m.
• Full on and off-ramp closures on southbound SR-99 at Acampo Road for sign work beginning Wednesday, March 4, through Thursday, March 5, from 9:00 a.m. until 2:00 p.m.

State Route 120 - Ramp Closures
Overnight Connector Ramp Closures From Manteca Bypass To I-5

San Joaquin County- The California Department of Transportation (Caltrans) will perform various closures on State Route 120 (SR-120) for maintenance and construction work within San Joaquin County. Work will occur as follows:

• Overnight, full connector ramp closures from westbound SR-120/Manteca Bypass to northbound I-5 for pavement work beginning Monday, March 2, through Friday, March 6, from 8:00 p.m. until 4:00 a.m.
• Full on-ramp closure from Main Street to eastbound SR-120/Manteca Bypass for pavement work on Tuesday, March 3, from 9:30 a.m. until 2:30 p.m.

Motorists should expect 5-to-10-minute delays and use alternate routes whenever possible. All work is scheduled to occur as listed but is subject to change due to traffic incidents, weather, availability of equipment/materials, and construction-related issues.

For the safety of workers and other motorists, please Be Work Zone Alert. Caltrans also reminds motorists to #KnowBeforeYouGo by checking QuickMaps on your mobile device or visit quickmap.dot.ca.gov for real-time highway conditions.