ALERTSF: Avoid the area of Lake St and Park Presidio Blvd due to An obstruction. Emergency crews are enroute. Avoid the area of Lake St and Park Presidio Blvd, Southbound lanes and part of northbound lanes are blocked by a fallen tree.

Expect traffi https://t.co/rxpIKF3QBv

— San Francisco Department of Emergency Management (@SF_emergency) January 5, 2023