Rose Quarter Underground: Looking at conditions from the bottom up

Fieldwork in the Rose Quarter Area

Crews will continue collecting soil samples throughout the Rose Quarter area through June. Sampling on and near I-5 will occur at nighttime and during the day on local streets. The work will ensure that designs are appropriate for local soil conditions and that construction activities are done safely.

What you will see and hear

Soil sampling will be conducted by heavy machinery: a truck-mounted rig for most locations (shown below) and a track-mounted rig for sites that are difficult to access. The work involves digging holes approximately 8 to 12 inches wide and up to 120 feet deep. They will be covered while not in use and backfilled within approximately two weeks.

Boring truck rig that will take soil samples.


Boring truck rig that will take soil samples.


Here’s what you can expect:

  • Work dates: May – June 2021
  • Nighttime work: Mon – Sat 8 p.m. to 5 a.m.
  • Daytime work: Mon – Fri 8 a.m. to 5 p.m.
  • Temporary closures and detours for people walking, biking, rolling, and driving
  • Partial lane closures

Visit TripCheck ( for details on specific closures and detours.

Soil sampling will occur in the I-5 Rose Quarter area along N Broadway St and N Vancouver Ave through June.

This field work is a continuation of the activity we provided notice for at the beginning of the year. While hazardous materials sampling at these sites is complete, some soil sampling along I-5 will continue through June.