Government officials and Valdez residents are worried about flash floods should the river break through the ice all at once and are monitoring the situation closely.
On a recent video posted to YouTube, you can see the destruction. At the 1:09 mark, you can see the water rushing into a tunnel. That tunnel is a partially completed railroad tunnel built in 1907 by the Guggenheim Syndicate. You can read more details about the colorful history (and a shoot out!!) here...
So here's the video of the avalanche. Again, the water entering the tunnel is evident at the 1:09 mark.