Bridgewater took a hard hit from Odafe Oweh on an incompletion with 53 seconds left in the half.
Bridgewater, who won the job over Lock in the preseason, went 7-of-16 for 65 yards and a touchdown in the first half. The Ravens led 17-7 at halftime.
Lock has yet to take a snap this season.
The Broncos downgraded receiver Diontae Spencer to out with a chest injury. He was injured the play before Bridgewater took his hard hit, and Spencer headed directly to the training room. Spencer was drilled by Chuck Clark on an incompletion that officials could have ruled an illegal hit but didn’t.