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2021-03-21-101-express-update

**Note: An extended ramp closure will occur this weekend in/near the cities of San Mateo and Foster City, from Sunday morning, March 21st, to Monday morning, March 22nd. See “Extended weekend closure” below for more details.

Construction Update – Week of March 21st

South of Whipple Avenue: This week, construction activities on U.S. 101 from San Antonio Road (in Palo Alto) to Whipple Avenue (in Redwood City) include overhead sign work, landscaping work, and minor construction activities.

North of Whipple Avenue: This week, construction activities on U.S. 101 from Whipple Avenue to I-380 (in South San Francisco) include restriping near the completed sections of sound wall on Bayshore Boulevard in the City of San Mateo (more information below); installation of stormwater drainage systems, permanent and temporary concrete barriers, new electrical boxes, lighting, traffic monitoring system components, and guardrails; temporary restriping; concrete and barrier demolition; overhead sign work; landscaping and erosion control work; electrical service work; roadway excavation; paving; drainage system maintenance; and minor construction activities.

Most of the work will occur on the freeway lanes, median, shoulders, and ramps, while restriping will occur near the completed sound walls and electrical service work will occur on city streets adjacent to U.S. 101. Construction activities may occur during the day or night, and noise from construction-related sounds such as backup alarms and hammering should be anticipated.

A newly-installed overhead variable toll message sign south of Whipple Avenue map

A newly-installed overhead variable toll message sign south of Whipple Avenue

Sound Wall Update 

All three sections of sound wall along Bayshore Boulevard, from Newbridge Avenue to just past Dakota Avenue, from 2nd Avenue to Dore Avenue, and from Dore Avenue to East Poplar Avenue, in the City of San Mateo have been rebuilt!

Restriping will occur near the completed sections of sound wall on Bayshore Boulevard in the City of San Mateo during the week of March 21st. This work will require temporary lane closures (one-way traffic) on Bayshore Boulevard between 7:00 AM to 5:00 PM, Monday through Friday. Cones and flaggers will safely direct traffic around closures. On-street parking along Bayshore Boulevard will be unavailable until this work is complete. This work was originally anticipated to be completed by March 19th but was delayed due to rain. All sound wall-related work is anticipated to be completed the week of March 21st.

OVERNIGHT FREEWAY CLOSURES FOR SIGN REMOVAL: In early April, an overnight closure on U.S. 101 will be required to remove an overhead sign structure in/near the cities of San Mateo and Foster City (between East Hillsdale boulevard and SR-92). Stay tuned to our weekly construction emails and visit the “Upcoming Overnight Closures on U.S. 101” page on 101express.com for updates as we work to finalize the timing for this closure. Thank you for your patience during this time!

Nighttime Freeway Lane Closures: Nightly freeway lane closures may occur on northbound and southbound U.S. 101 from 7:00 PM to 6:30 AM, Saturday night to Friday morning. Due to low traffic volumes, project-related traffic delays are anticipated to be minimal. Caltrans continues to monitor the flow of traffic and make adjustments, as necessary.

Freeway Ramp Closures: Temporary ramp closures may occur during the day or night. Ramp closures could occur in both the northbound and southbound directions of the freeway. However, consecutive interchanges for northbound and southbound ramps will not be closed at the same time.

Extended weekend closure: The following ramp is scheduled to be closed for approximately 24 hours in/near the cities of San Mateo and Foster City. The ramp will close after 5:00 AM on Sunday, March 21st, and reopen by 5:00 AM on Monday, March 22nd. Detour signs will be posted and changeable message signs near the ramp will be in place with the exact closure times:

  • Eastbound East Hillsdale Boulevard, Southbound U.S. 101 On-Ramp

Nighttime ramp closures: Short-term nighttime ramp closures are possible the week of March 21st (between Sunday night and Friday morning) in/near the cities of Redwood City, San Carlos, Belmont, San Mateo, Foster City, Burlingame, Millbrae, San Bruno, and South San Francisco at the following locations (listed from south to north). Changeable message signs near the ramps will have exact closure times and locations.

South of Whipple Avenue:

  • Eastbound/Westbound Seaport Boulevard, Northbound U.S. 101 On-Ramp

North of Whipple Avenue:

  • Westbound Whipple Avenue, Southbound U.S. 101 On-Ramp
  • Brittan Avenue, Southbound U.S. 101 On-Ramp
  • Eastbound/Westbound Holly Street, Southbound U.S. 101 On/Off-Ramp
  • Westbound Marine Parkway, Northbound U.S. 101 On-Ramp (Closures possible starting at 5:00 PM at this location)
  • Eastbound/Westbound Ralston Avenue, Southbound U.S. 101 On/Off-Ramp
  • Eastbound East Hillsdale Boulevard, Northbound U.S. 101 On-Ramp
  • Eastbound East Hillsdale Boulevard, Southbound U.S. 101 On-Ramp
  • Southbound U.S. 101, Eastbound/Westbound East Hillsdale Boulevard Off-Ramp
  • Northbound U.S. 101, Eastbound/Westbound East Hillsdale Boulevard Off-Ramp (Closures possible lasting until 7:00 AM at this location)
  • Westbound East Hillsdale Boulevard, Southbound U.S. 101 On-Ramp
  • Eastbound Route 92, Northbound U.S. 101 Connector Ramp
  • Westbound Route 92, Northbound U.S. 101 Connector Ramp
  • Westbound Route 92, Southbound U.S. 101 Connector Ramp
  • Northbound U.S. 101, Eastbound/Westbound Route 92 Connector Ramp
  • Southbound U.S. 101, Eastbound/Westbound Route 92 Fashion Island Boulevard Connector Ramp
  • Kehoe Avenue, Northbound U.S. 101 On/Off-Ramp
  • Eastbound/Westbound 3rd/4th Avenue, Southbound U.S. 101 On-Ramp
  • Eastbound Millbrae Avenue, Northbound U.S. 101 On-Ramp
  • Southbound U.S. 101, Eastbound/Westbound Millbrae Avenue Off-Ramp
  • Westbound Millbrae Avenue, Northbound U.S. 101 On-Ramp
  • SFO Domestic Terminals, Southbound U.S. 101 On-Ramp
  • Airport Boulevard, Northbound U.S. 101 On-Ramp
  • Southbound U.S. 101, Produce Avenue/Airport Boulevard Off-Ramp

Weekend overnight closures: Short-term nighttime ramp closures are possible the weekend of March 19th (between Friday night and Saturday morning, and Saturday night and Sunday morning) in the City of Belmont at the following locations (listed from south to north). Changeable message signs near the ramps will have exact closure times and locations.

Weekend of March 19th:

  • Eastbound/Westbound Ralston Avenue, Southbound U.S. 101 On/Off-Ramp (closures possible lasting until 10:00 AM at this location)

Nighttime ramp closures:

  • Will be displayed on changeable message signs within the construction zone
  • Will begin after 7:00 PM and reopen by 6:00 AM, unless otherwise noted above
  • Will have detour signs posted

City Streets: In addition to the sound wall activities described above, work to connect power to overhead signs and freeway lighting will occur on streets in the cities of San Mateo and South San Francisco. Nearby residents and travelers can expect to see crews from 8:00 AM to 5:00 PM, Monday through Friday. This work will produce intermittent low vibrations and construction vehicle noise, and will also require temporary lane closures (one-way traffic). Cones and flaggers will safely direct traffic around closures. Electrical service work may occur in the following areas:

  • 19th Avenue and Fashion Island Boulevard in the City of San Mateo
  • South Amphlett Boulevard and 10th Avenue in the City of San Mateo
  • South Airport Boulevard and Wondercolor Lane in the City of South San Francisco

Upcoming Construction (South of Whipple Avenue): Construction activities in the coming weeks on U.S. 101 from San Antonio Road (in Palo Alto) to Whipple Avenue (in Redwood City) will include overhead sign work, landscaping work, and minor construction activities.

Upcoming Construction (North of Whipple Avenue): Construction activities in the coming weeks on U.S. 101 from Whipple Avenue to I-380 (in South San Francisco) will include an overnight closure in/near the cities of San Mateo and Foster City to remove an overhead sign bridge; the installation of overhead sign foundations, electrical boxes, guardrails, stormwater drainage systems, traffic monitoring system components, lighting, and temporary concrete barriers; grading; paving; temporary restriping; erosion control work; landscaping work; overhead sign work; concrete and barrier demolition; roadway excavation; stormwater drainage system maintenance; electrical service work; and minor construction activities.

For questions during construction, contact the Caltrans Public Information Officer:    

Alejandro Lopez at (510) 385-6856 or 101express@dot.ca.gov. 

All construction activities are subject to change without notice.

Visit our website at 101express.com for more information about the project. Follow us on Twitter @CaltransD4.

If you would like a copy of a prior construction update, please email 101express@dot.ca.gov.

If you would like a copy of a prior construction update, please email 101express@dot.ca.gov.