bridge over troubled waters

a bridge too far

A step or action that is too ambitious; an act of overreaching.

bridge the gap

To serve as or create a connection between disconnected or disparate things.

burn that bridge when one comes to it

To anticipate dealing with a problem or situation either by acting in a manner that alienates or cuts ties with others, or merely with the expectation of encountering trouble.

cast one's bread upon the waters

To perform a kind deed or favor without the motivation of any immediate reward or benefit to oneself, though with the possibility of eventual future return.

cross that bridge when one comes to it

To deal with a problem or situation only if and when it arises.

fish in troubled waters

To try to take advantage of a confused or troubled situation.

I have a bridge to sell you

An indirect way of expressing that the addressee is gullible.

muddy the waters

To make something unclear and difficult to understand.