Admittedly harebrained. Drill thin holes into the core of the bridge at key points. Insert a strain sensor into the each hole. Each sensor would be connected by wire to the outside of the hole. Each sensor would incorporate a rechargeable battery and RF transmitter circuitry. On the outside of the hole would be an antenna for broadcasting signal and a solar cell for recharging the battery.
When a problem developed, a warning signal would be broadcasted. There would also be periodic "I'm OK," broadcasts to show that the system was still functioning. Probably, there would be a number of sensors and one bridge but only one antenna and solar cell array feeding and fed by all the sensors. This would allow the antenna and solar cell array to be in a transparent vandal-proof plastic box.
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