A 23-year-old woman was struck by a semi-trailer truck Saturday morning on the northwest corner of North McDowell Boulevard and East Washington Street.

Heather Kontos of Petaluma was hit at 6:13 a.m. and suffered major pelvis injuries, according to Petaluma police. She was transported to Santa Rosa Memorial Hospital.

The semi was driven by Joseph Jones, 36, and police said it is unclear whether Kontos was on the sidewalk or in the roadway at the time of the incident.

The hospital reported that Kontos was in critical condition.

The incident is under investigation and police ask witnesses to contact Officer Bert Walker at 778-4455.

-- Martin Espinoza