CAMBUS will maintain service during severe weather within reasonable and safe practices. During extreme weather events, CAMBUS may need to unexpectedly modify or suspend all service. Riders are encouraged to subscribe to alerts from the CAMBUS service app Transit, the National Weather Service, and University of Iowa Hawk Alerts. Notifications and alerts from Transit app will provide the most up-to-date service information directly to your mobile device.

If sirens are sounded in Johnson County for severe weather, CAMBUS service will stop until the severe weather warning issued expires.

CAMBUS will announce service modifications and disruptions via the app TransitFavorite the routes you ride to receive alerts. When possible, CAMBUS may also post alerts to social media channels (@uiowacambus) and the department website.

Get alerts and follow CAMBUS
  • Transit Download the app. Favorite the route(s) you ride to receive alerts. Tap on the pin icon next to the route name to favorite the route.

  • Twitter and Facebook @uiowacambus

  • Subscribe Riders are encouraged to subscribe to alerts from the National Weather Service and University of Iowa Hawk Alerts.

Severe Thunderstorm Warning or Tornado Warning

During a National Weather Service-issued Severe Thunderstorm Warning or Tornado Warning for Johnson County, CAMBUS will suspend service immediately. Riders should not remain on buses or wait at CAMBUS stops; riders should seek shelter in a nearby building immediately. CAMBUS will resume service after the warning has expired or once it has been determined that the Iowa City and Coralville areas are no longer under direct threat of the severe weather and/or tornado.

Flash Flooding

Streets may become impassable for buses during flash flooding. CAMBUS may need to modify routes to avoid flooded roadways. Areas that are susceptible to flash flooding include: Newton Road near the VA Hospital, Iowa Avenue between Riverside and Madison and North Riverside Drive near River Street.

Ice and Snow Events

CAMBUS will continue to run during ice and snow events, however significant delays are to be expected. If ice and/or snow events are so severe that University classes and other operations are closed, CAMBUS may reduce or suspend service. For additional information, please refer to the CAMBUS snow detours page.

CAMBUS will make every effort to maintain current and accurate information on our website, Facebook and Twitter. For questions, comments or concerns, please call CAMBUS at (319) 335-8633 or email If calling CAMBUS before 7:30 AM please call the CAMBUS Maintenance Facility (319) 335-5208.