The bridge_131009_2956.zip file you have requested: Maps Levels Missions / Survival Maps / Left 4 Dead Survival Map Bridge - 1.35mb is not available. Perhaps try browsing all files for the game Left 4 Dead and upload any files you want to share or are missing. This is the only information we could locate:
It still dosent have nav but i will make it later. It's a small survival map on a broken bridge.