Update: According to Bike Boldly, numerous bikeways and bike access to bridges have been indefinitely closed due to the I35W bridge collapse. The city of Minneapolis announced these road and bridge closures that impact cyclists:
WEST RIVER PARKWAY Closed between 13th Ave S to 1st St S Local access only between 11th Ave and 13th Ave S Local access between 4th St and 1st St S
2nd STREET SE Closed between 8th Ave SE to 11th Ave SE Local access between 3rd Ave SE and 8th Ave SE Local access only on 11th Ave SE between University Ave and 2nd St SE
STONE ARCH BRIDGE Closed until further notice
BRIDGE #9 - DINKYTOWN BICYCLE CONNECTION Closed until further notice
Minneapolis area bicycle bloggers comment on the bridge collapse.