State troopers and Seattle firefighters rescued a man hanging from an Interstate 90 bridge joint Wednesday morning with the help of some witnesses. Firefighters fielded calls to the site about 11:37 a.m. at westbound I-90 near Rainier Avenue South. A homeless man in his 30s living in the area had apparently slipped and fell and clung to a bridge joint to prevent him from falling about 20 feet down, Capt. Shata Stephenson of the Seattle Fire Department said. Passersby reportedly stopped and offered responding state troopers some ladders, which allowed them to bring the man down. The man suffered minor injuries and was taken to Harborview Medical Center.