Soil sampling on I-5 scheduled to start in July

Crews are expected to collect soil samples in the Rose Quarter area starting mid-July and continuing until October. The work will ensure the I-5 Rose Quarter Improvement Project can provide information that will help answer questions raised by community members during the Environmental Assessment review about soil stabilities and the highway covers, informs legislative requirements outlined in House Bill 2017, and informs future urban design opportunities.

The soil sampling will require some earthwork, site grading, and clearing limited sections of bushes along I-5.

What you will see and hear

Crews will use two different types of machines to collect soil. The majority of soil samples will be collected using a truck-mounted rig. Sites with difficult access will require use of a track-mounted rig. You may hear some noise while crews work nearby, but activities will be no louder than typical highway traffic. The holes will be approximately 8 to 12 inches wide and up to 120 feet deep. They will be backfilled within approximately two weeks of sampling and will be covered while not in use.

Here’s what you can expect:

  • Daytime work: Mon – Fri, 8 a.m. to 6 p.m.
  • Nighttime work: Mon – Sat, 10 p.m. to 5 a.m.
  • Lane closures and detours: Expect temporary nighttime lane closures on I-5 and daytime traffic impacts.

View the ODOT’s Weekly Construction Update and visit TripCheck for details on specific closures and detours – updates will be posted regularly until soil sampling is complete.

Locations of drilling activities along I-5 between I-405 and I-84.

Soil sampling will occur in the Rose Quarter and Albina area along I-5 and on/off ramps, shoulders, and nearby local streets between I-84 and I-405.

Truck-mounted rig used for soil sampling at most locations (left). Track-mounted rig used for soil sampling on sites with limited access (right).