Ledges State Park, Iowa

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Canyon Road Bridge (Boone County, Iowa)
Built 1933
Steel stringer bridge over Pease Creek on Canyon Road (250th Street)
Open to traffic

Ledges State Park Low Water Crossings #1-6 (Boone County, Iowa)
Built 1941
Slab bridge(s) on Canyon Road (250th Street) under Pease Creek
Open to traffic

Lost Ledges State Park Bridge (Boone County, Iowa)
Lost Bridge over Pease Creek on Pedestrian Path
No longer exists

Lower Ledges Road Bridge (Boone County, Iowa)
Built 1933
Steel stringer bridge over Pease Creek on Canyon Road (250th Street)
Open to traffic

Sixteen-to-One Bridge (Boone County, Iowa)
Condemned 1947; Washed away 1954
Lost Pennsylvania through truss bridge over Des Moines River on IA 164
Destroyed by flooding

Stone Bridge (Boone County, Iowa)
Built ca. 1933
Stone arch bridge over Pease Creek on trail
Open to pedestrians