Traffic around UCSF Medical Center at Mission Bay slowed to a crawl yesterday as police and emergency crews converged on the hospital complex, and the city issued an AlertSF advisory urging people to stay away.
City advisory
According to the San Francisco Department of Emergency Management, the AlertSF message warned people to avoid the area around UCSF Mission Medical Center at Mission Bay and noted that emergency crews were on scene. The post also urged travelers to consider alternate routes and included a link to live traffic information. Officials advised anyone who must drive through the area to plan ahead and expect delays. We will update this story if city or hospital officials release additional details.
ALERTSF: Avoid the area of UCSF Mission Medical Center at Mission Bay due to Police Activity. Emergency crews are on scene.
— San Francisco Department of Emergency Management (@SF_emergency) March 31, 2026
Expect traffic delays, consider alternate routes, and allow for additional travel time. For live traffic information visit ht https://t.co/5WjrrkpO5T
Where this is happening
The advisory focuses on the UCSF Medical Center complex in Mission Bay, a multi-hospital campus along Fourth Street that includes both adult and pediatric facilities. UCSF lists the primary Mission Bay hospital address as 1975 4th Street. With the campus nestled among several major streets, any police activity in the area can quickly ripple out, affecting access to appointments and slowing movement along nearby blocks.
Traffic and transit
The department warned drivers to expect traffic delays and to allow extra travel time while emergency crews work in the area. For real-time road conditions and any reported closures, travelers are encouraged to check the Bay Area 511 traffic map before heading out. Transit riders planning a trip to or through Mission Bay should review Muni service alerts in case routes near the campus are impacted.
What we know so far
As of publication, city and hospital officials have released only the initial AlertSF advisory and have not provided further details about the cause or scope of the police activity. The AlertSF message remains the primary public notice at this time. We will report new information if law enforcement or UCSF issues additional statements.
