Trying to catch up with myself before the end of the challenge. Although I love water and bridges I found myself stumped again, so thought it could be time for an acrostic!
Barely there, a charcoal smudge
Reflected dimly on the sluggish surface.
In times of spate it seems to swell,
Digging deep against the savage flow;
Gradually reappearing, as floods recede.
Eddies now ripple meekly round stone abutments,
Solid and soaring.