Part of Zintel Canyon was closed after a fire scorched six acres Tuesday afternoon.
The popular walking area will be off limits between West 15th Avenue and 24th Avenue until further notice, said officials with the city of Kennewick.
City crews will be checking to see what needs to be cleared out and if the area is safe.
The suspicious fire is under investigation, said Kennewick fire Capt. Brian Ellis. It started along the western side of the canyon around 3 p.m. and burned up the hillside. No homes were threatened.
Firefighters were able to contain it in about an hour.
Benton County Fire District 1, Walla Walla Fire District 5, and Pasco Fire Department helped extinguish the fire.