This trailer flipped over Wednesday night along Sawmill Creek Road. The truck pulling it stayed upright and was detached after the accident. Police are investigating. (KCAW photo by Holly Keen)

This trailer flipped over Wednesday night along Sawmill Creek Road. The truck pulling it stayed upright and was detached after the accident. Police are investigating. (KCAW photo by Holly Keen)

Sitka police are investigating a Wednesday night accident that left a semi-truck trailer flipped over on its side along Sawmill Creek Road.

The accident happened in the 2400 block of Sawmill Creek Road, just beyond Shotgun Alley.

Sitka police Lt. Barry Allen says authorities responded around 10:15 p.m. to a call from a passing motorist who saw the truck on its side. The driver, who was uninjured, told police his load shifted as he came around a corner. Allen says the driver tested negative for alcohol.

The truck was carrying empty fish totes, and was headed outbound to Silver Bay Seafoods. The state Department of Transportation’s Commercial Vehicle Enforcement unit is also consulting on the case.