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A SMALL BRIDGE PROBLEM

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In a property in Oregon ther is 18' bridge, fairly wide, for vehicular traffic as well.
Due to action of a stream it spans, one end of it has sunk visibly.
I am aware of only two ways of fixing it:
 
1. Lift the end and push something (?) underneath.
2. Inject into the ground one of those swelling liquids,
which I was once told, have this capacity.
 
Do those two methods work?
Is there a better way?
 
Sincerely
 
Gregory from Oz