|USCG Photo from MarineLog|
|"CSX Railroad Bridge over the Cumberland at Nashville, 2010, MNA" from Nashville History|
|Joe Tessmer shared|
Railroad Bridge on Cumberland River at Clarksville. Flood of 1937.
From USACE collection.
Calvin Sneed's photo shows over 45' of clearance during more normal times. It looks like there was also at least 45' of clearance in July 2008 when Jack Schmidt took a photo.