Downed power lines are stopping traffic on Biscayne Boulevard near the Interstate 195 overpass.
Power was out Tuesday at 6:30 p.m. between Northeast 32nd and 39th streets and in the three blocks west of Biscayne Boulevard.
Biscayne Boulevard is closed from 36th Street to 39th Street, and the exit ramp from eastbound I-195 to Biscayne Boulevard is closed. Traffic is backed up for miles on Biscayne Boulevard in both directions.
The exit ramp from the westbound Julia Tuttle Causeway is open.
Miami police are redirecting traffic west to avoid the affected area.
Miami Fire Rescue spokesman Ingatius Carroll said the suspected cause is a blown transformer, and that Florida Power and Light was working to restore power.