According to the email I got:
This bridge is on the Old Donner Pass Highway. It has spectacular Sierra views and views of Donner Lake and Donner Pass on Route 80.
A bear was walking across Rainbow Bridge (Old Hwy 40 at Donner Summit,Truckee) on Saturday when two cars also crossing the bridge scared the bear into jumping over the edge of the bridge.
Somehow the bear caught the ledge and was able to pull itself to safety. Authorities decided that nothing could be done to help Saturday night so they returned Sunday morning to find the bear sound asleep on the ledge.
After securing a net under the bridge the bear was tranquilized, fell into the net, lowered, then woke up and walked out of the net.