I-405 Improvement Project drilling and other work to take place over next two weeks

Drill Exploration Activities for the I-405 Improvement Project will occur intermittently throughout the project area the week of Nov. 6 to Nov. 9 and the week of Nov. 13 to Nov. 17.

In an effort to make travel easier for motorists this Veterans Day holiday weekend, pre-construction activities will be suspended on Friday, Nov. 10, 2017 and will resume, Monday, Nov. 13, 2017.

Drilling exploration, nest avoidance and ADL sampling activities will be conducted at night, between 9 p.m. to 5 a.m. and during the day, between 9 a.m. to 3 p.m.

Drill exploration is performed to obtain information on the soil and rock around a site in order to design structures. Crews will be on the northbound (NB) and southbound (SB) shoulders, and on- and off-ramps of the I-405 freeway, as well as on local streets.

Nest avoidance is performed prior to the start of construction to prevent birds and bats from nesting inside structures. ADL sampling is performed to obtain information on soil on the NB and SB shoulders of the I-405 freeway. Samples are obtained to measure toxicity as a part of dust control measures.

Please be advised that this work may be loud, and dates are subject to change based on inclement weather and other operational factors.

In Costa Mesa, work is planned for the following times and place:

Nighttime Work – 9 p.m. to 5 a.m.
  • NB I-405 HOV and #1 lane from MacArthur Boulevard to SR-73


I-405 expansion work to take place this week

As part of the I-405 Improvement Project, OCTA announced that beginning Monday Oct. 9, construction work will take place from 9 p.m. to 5 a.m. at the following locations:

  • NB I-405 HOV inside lane from MacArthur Boulevard to SR-73
  • NB I-405 merge lane from Bristol Street to South Coast Drive
  • SB I-405 / SR-73 connector to Bear Street
  • SB I-405 near Harbor Boulevard to Fairview Road
  • Fairview Road bridge
  • Harbor Boulevard bridge

OCTA in cooperation with The California Department of Transportation (Caltrans) is widening the San Diego Freeway (I-405) between State Route 73 (SR-73) and Interstate 605 (I-605). The project will improve 16 miles of I-405 between the SR-73 freeway in Costa Mesa and I-605 near the L.A. County line.