LANSING, Iowa — Engineers have postponed demolition of the Black Hawk bridge one day, to Friday at 9:30 a.m. The reason: Logistics. Weather could cause a further delay. An 850-foot implosion zone has been marked off on both the Iowa and Wisconsin sides: No cars, no people. Plans call for two implosions separated five minutes, each preceded by a siren alert. Watch online.
Earlier: Lansing bridge: Good-bye, ol’ friend