Damaged by flooding

NH - Quinebaug River Bridge (Windham County, Connecticut)
Two southern spans lost to 1955 floods, line abandoned 1959, remainder demolished at a later point
Lost Deck plate girder bridge over Quinebaug River, River Road, and Kennedy Drive on NYNH&H Midland Division
Replaced by a pedestrian bridge

Okoboji Bridge (Dickinson County, Iowa)
Built in 1909 over the strait between West and East Okoboji Lakes, replaced in 1926 but the truss span was relocated to its present spot.
Pony truss bridge over a branch of Little Sioux River on 180th Avenue
Knocked off its foundation by flooding in 2011. Bridge taken out of the river and is currently sitting at the end of a dead-end road. Future unknown.