25' is quite a long distance to cover. This is something you are going to want to get a engineer out for.
For starters utility poles are not strong in the way you want to use them. They are used for a compression type weight (such as supporting wires, ect) Ever seen what a car can do to one? They are intended to break easily if hit/flexed/sheered.
If your bridge doesnt hold when a concrete truck goves over it, I'm sure the owner of it will be talking to you about paying for damages caused+ the wasted load of concrete. Your insurance company will look at it too, and if it was not a safe/proper/inspected design, they may deny any claims on it. Concrete trucks are not cheap.
If your house catches fire, the last thing you want happening is the fire dept stopped at the base of the bridge debating if they want to risk crossing it or not....or what they are going to do next, if the bridge doesnt hold their weight... Meanwhile your house is burning down.