I must disagree with Marquhar. How could anyone miss that bridge in broad daylight? By not looking where they are going, that's how. Was he chatting with his buddies, grinding with his head down or scrolling through his Garmin? I've been riding that trail for 12 years and have never heard about anyone being injured there. The bridge does have bollards to keep the motos off and there are a couple of turns involved, so it's not an area that a peloton of Lance wannabes can speed through; that is likely why lighting velo avoids it (too bad they don't avoid MUPs altogether IMO those guys are the biggest hazard out there). One accident does not a dangerous condition make. I bet more cagers have hit cyclists on the surrounding streets than cyclists have ridden off the path there.
Heading downstream to the bridge, the pavement is broken and rutted, so high speeds are reckless at best. However, it is flat for quite a distance and the bridge and the 45 degree curve to it are clearly visible. I think Bob's diagram is a bit alarmist, none of the turns are blind.
Bob also suggested a fence. If the guy was not paying enough attention to see a bridge, why would we expect him to see a fence? What if there was a person walking a baby stroller or someone had fallen on the path? Both of which I see on CCT from time to time.
I really hope he makes a full recovery.