you should have done a Security-Secruity on your VHF to let everyone know what happened to you because the Coast would have picked up the message! does not matter at this point of time. in the channel you went thru was what current wise out of lake or into lake? if out of lake the obstruction will move into shallower water! if into the lake let Coast Guard know so they can put out a Security-Security to let others in your area know.
if you were not leaking at dock when you got back more than likely the boat will not. how-ever your insurance will require you to check right away if there is damage, so they can settle claim and or have repairs made, to satisfy you.
you more than likely did not sustain dmg, at that speed but, you should still check asap.