How can I tell Navigation to NOT use a specific street or road its given me?

I live in the mountains and roads open and close all the time. It would be nice if I could go into my turn-by-turn direction details, long press a particular part of the route and tell it DO NOT USE. That would allow Navigation to route me around the roads that I know are closed, but it doesn't! Google can't keep up with as fast as the road conditions change here...

Thanks for the help!