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January 5, 2011
For Immediate Release << back

Two Overnight Closures on Hwy 1 at Hwy 101 Interchange

SAN FRANCISCO - There will be two overnight closures of Highway 1 this weekend as work continues to replace Doyle Drive. Beginning Friday, January 7 at 10 p.m. to 10 a.m. the next morning, the ramp from northbound Highway 1 to northbound Highway 101 will be closed. The closure will begin at Lake Street. Then, beginning Saturday, January 8 at 10 p.m. to 10 a.m. the next morning, the ramp from southbound Highway 101 to southbound Highway 1 will be closed.

Optional trips should be avoided during these closures. 

The closures were scheduled for a time when traffic volumes are lowest.  

Construction Phasing and New Roadway Alignment after the Closures
The two overnight closures are necessary to temporarily shift northbound and southbound traffic to the newly completed section of the Ruckman Bridge. This shift allows traffic to continue moving while the remaining portions of the permanent Ruckman Bridge are built. Construction of the Presidio Parkway has been carefully planned to allow mainline traffic to flow during construction of the new roadway. The bridge is expected to be complete by mid-2011.

The first 400 feet of the new southbound Highway 1 configuration will be reduced to one lane from two lanes for approximately 4-6 months. Southbound traffic will return to two lanes before entering the MacArthur Tunnel. Drivers should be aware of the new roadway alignment and southbound merge.

See the advisory for maps and detour routes.

Weekend Detour Routes
For the northbound closure beginning Friday, January 7, detour signage will direct motorists traveling northbound from Highway 1 to Highway 101 via Geary Boulevard/Van Ness Avenue/Lombard Street.

For the southbound closure beginning Saturday, January 8, detour signage will direct southbound travelers to continue on Highway 101 (Lombard Street and Van Ness Avenue) to Geary Boulevard to Highway 1/Park Presidio Boulevard.

These detour routes were selected because they are able to carry a high volume of traffic and use relatively flat streets. The signed detour must be accessible to all vehicles, including large trucks, motor homes, etc.; however, most people will choose their alternate route based on what is most convenient for their trip.

Construction Webcam and Traffic Shift Simulation
After traffic is moved onto the new section of the Ruckman Bridge, the remaining old bridge lanes will be demolished and reconstructed. This work can be seen via webcam at

Two Overnight Closures on Hwy 1 at Hwy 101 Interchange
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Simulation of Ruckman Traffic Shift on Hwy 1, January 2011
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