The bridge which crosses the River Ameca from Puerto Vallarta, Jalisco to Nuevo Vallarta, Nayarit has collapsed with some injuries and some people missing. (updated 5:30, Tuesday 31 August)

This early release version will be updated as more details emerge but it looks like there is no travel allowed on the bridge between PV and Nuevo:

http://jaltembajalapeno.com/2010/08/31/bridge-collapse-in-puerto-vallarta/