2020-12-20-101-express-Update

**Note: this construction update will provide an overview of upcoming work over the next three weeks, through the week of January 3rd. Additionally, nighttime work near the removed sound wall along Bayshore Boulevard may occur the week of December 20th. See below for more details.

End of Year Construction Schedule: As noted below, construction will briefly pause Wednesday night, 12/23 through Sunday night, 1/3. The project team wishes you all a safe and healthy end of the year!

Construction Update – Weeks of December 20th Through January 3rd

Week of December 20th: Construction activities on U.S. 101 from Whipple Avenue (in Redwood City) to I-380 (in South San Francisco) will include installing stormwater drainage systems, overhead signs, temporary lighting, and temporary ramp metering; grading; roadway excavation; stormwater drainage system maintenance; restriping; concrete demolition; and other related construction activities. Construction activities during this week will end on Wednesday, December 23rd.

Week of December 27th: No construction is scheduled to take place during this time. Staff will be available to perform maintenance if needed.

Week of January 3rd: Crews will return to work on Monday, January 4th. Construction activities on U.S. 101 from Whipple Avenue to I-380 will include continued work near the removed sound wall along Bayshore Boulevard (from 2nd Avenue to Dore Avenue) within the City of San Mateo; nighttime pile driving in the City of San Carlos; daytime retaining wall work in the City of San Mateo; and extended weekend ramp closures during the weekend of January 9th. Additional work will include installing overhead signs, guardrail, and temporary concrete barrier; grading; paving; roadway excavation; stormwater drainage system maintenance; erosion control work; and other related construction activities.

Most of the work will occur on the freeway lanes, shoulders, and ramps, while sound wall work will occur on city streets adjacent to U.S. 101. More information is provided below.

Photo of construction crews placing roadway base material in the freeway shoulder

Construction crews placing roadway base material in the freeway shoulder.

Daytime Retaining Wall Work in the City of San Mateo

Retaining wall work in the City of San Mateo is scheduled to take place the week of January 3rd. Construction crews will install the foundation of a retaining wall using a hydraulic hammer (also known as pile driving) on Southbound U.S. 101, south of the on-ramp from East Hillsdale Boulevard. This work is scheduled to take place from 1:00 PM to 9:00 PM over 5 non-consecutive working days once initiated.

Noise and vibration from the intermittent use of a hydraulic hammer as well as other common construction-related sounds such as backup alarms should be anticipated.

In addition, the closure of Eastbound East Hillsdale Boulevard to Southbound U.S. 101 On-Ramp and Westbound East Hillsdale Boulevard to Southbound U.S. 101 On-Ramp will be required for safety reasons.

Check the “Construction Update” tab on [101express.com]101express.com for schedule updates.

Nighttime Pile Driving Work in the City of San Carlos

Nighttime pile driving in the City of San Carlos is scheduled to take place the week of January 3rd. Construction crews will be pile driving on Northbound U.S. 101, adjacent to the on-ramp from Westbound Holly Street, in the City of San Carlos. This work will support the construction of a concrete barrier containing a ramp metering pole, that will manage the flow of traffic from the Westbound Holly Street On-Ramp. Travelers may see construction crews between the hours of 8:00 PM to 5:00 AM.

Extended Weekend Ramp Closures January 9th – 11th

Construction crews are planning to implement extended weekend ramp closures during the weekend of January 9th in/near the cities of San Carlos, Belmont, Foster City, and San Mateo  in order to facilitate drainage system work across the ramps.

The closures are scheduled to begin after 11:00 PM on Saturday night, January 9th, and end by 6:00 AM on Monday morning, January 11th. Detour signs will be posted and changeable message signs will indicate exact closure times and locations.

Extended weekend ramp closures are anticipated to occur at the following locations:

  • Eastbound Hillsdale Boulevard, Northbound U.S. 101 On-Ramp
  • Eastbound 3rd/4th Avenue, Northbound U.S. 101 On-Ramp
  • Poplar Avenue, Southbound U.S. 101 On-Ramp
  • Harbor Boulevard, Southbound U.S. 101 On-Ramp

Sound Wall Work: Construction on the sound wall on Bayshore Boulevard, from 2nd Avenue to Dore Avenue in the City of San Mateo, is paused until January 4th. Once this work resumes, construction crews will continue to implement periodic traffic control. Traffic control may occur from 8:00 AM to 5:00 PM, Monday through Friday. Watch for detour signs. After 5:00 PM, the road will be restored to two-way traffic. 

During the week of December 20th, construction crews will install overhead signs on U.S. 101, adjacent to the removed sound wall along Bayshore Boulevard, from 2nd Avenue to Dore Avenue, in the City of San Mateo. This work may occur from 9:00 PM to 5:00 AM and may include noise from backup alarms and heavy equipment. This work is anticipated to conclude by Wednesday, December 23rd.

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, Sunday night to Friday morning, during the weeks of December 20th and January 3rd. Closures are not anticipated to occur December 24th – January 3rd. Due to low traffic volumes, project-related traffic delays are anticipated to be minimal. Caltrans will continue to monitor the flow of traffic and make adjustments, as necessary.

Freeway Ramp Closures: Temporary ramp closures may occur during the 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.

Nighttime ramp closures: Short-term nighttime ramp closures are possible the weeks of December 20th and January 3rd (between Sunday night and Friday morning). Closures are not anticipated to occur December 24th – January 3rd. Closures are anticipated 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.

  • Southbound U.S. 101, Whipple Avenue Off-Ramp
  • Eastbound/Westbound Ralston Avenue, Southbound U.S. 101 On/Off-Ramp
  • Kehoe Avenue, Northbound U.S. 101 On/Off-Ramp
  • Northbound U.S. 101, Eastbound Dore Avenue Off-Ramp
  • Poplar Avenue, Southbound U.S. 101 On/Off-Ramp
  • Northbound U.S. 101, Northbound Broadway & Old Bayshore On/Off-Ramp
  • Westbound Millbrae Avenue, Southbound U.S. 101 On-Ramp
  • Southbound U.S. 101, Eastbound/Westbound Millbrae Avenue Off-Ramp
  • Southbound U.S. 101, Southbound SFO Off-Ramp
  • Northbound U.S. 101, Eastbound San Bruno Avenue Off-Ramp
  • Eastbound I-380, Northbound U.S. 101 Connector Ramp

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

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.