Rock Valley is a small town in extreme northwestern Iowa.    It had two branch lines of the Milwaukee Road.  Today, one is the Dakota & Iowa Railroad while the other has been abandoned.  
Bridges
 
 
Warren Pony Truss Bridge over Big Sioux River
Fairview Rail Bridge
 
 
Warren Pony Truss Bridge over Big Sioux River
Oak Ridge Rail Bridge
 
 
Pratt Pony Truss Bridge over Big Sioux River
Rock Valley Trail Bridge
 
 
Pratt Through Truss Trail Bridge over Rock River
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