Update [01/09]
One westbound lane reopens, with restrictions, on Key Biscayne’s Bear Cut Bridge (Miami Herald)

"Emergency lane restrictions have been implemented on the Bear Cut Bridge along the Rickenbacker Causeway. The Public Works and Waste Management Department is routing vehicular traffic in a counter flow manner on two lanes of the current eastbound portion of the bridge (toward Key Biscayne). One lane will be used for eastbound vehicular traffic and the other will be used for westbound vehicular traffic (leaving Key Biscayne). This will reduce traffic flow to one vehicular lane in each direction over the Bear Cut Bridge. Eastbound bicyclists in the bike lane are being directed onto the off road path. Westbound bicyclists in the westbound bike lane are unaffected."

If you have any questions or concerns, kindly contact the Miami-Dade Public Works And Waste Management office at (305) 361-2833.

Related links:
Rickenbacker Riders, Heed Safety Tips (Green Mobility Network)
2 lanes to Key Biscayne rerouted (Local 10)
Bear Cut Bridge Shutdown Shifts All Traffic (Transit Miami)
Key Biscayne traffic slow, confusion for cyclists, on Bear Cut Bridge (Miami Herald)
Cierre de puente entre Key Biscayne y Virginia Key (Univision 23)
Miami-Dade to shut westbound lanes on Bear Cut Bridge from Key Biscayne (Miami Herald)
Westbound Lanes of Bear Cut Bridge To Shut Friday (NBC 6)
'Structural Deficiencies' From Corroded Steel Cause Lane Closures On Bear Cut Bridge (WLRN)
Bridge to Key Biscayne shut down for repairs (WSVN 7)
Bear Cut Bridge Westbound Lanes Closed For Up To 1 Year (CBS 4)
Bear Cut Bridge Lanes Closed After Rickenbacker Causeway Deemed... (Huffington Post)