Stone, Boomer & Boyington

of Davenport, Iowa
Blackwater River Covered Bridge (Saline County, Missouri)
Built 1852
Lost covered bridge over Blackwater River somewhere in Saline County
No longer exists

Eddyville Bridge (Older) (Monroe County, Iowa)
Built 1858
Lost Howe pony truss bridge over Des Moines River on Road
Replaced by a new bridge

First Bridge (Rock Island County, Illinois)
Woodwork, 1856
Lost Howe through truss bridge over Mississippi River
Lost

Lower Bridge (1st) (Hennepin County, Minnesota)
Built 1857
Lost Bridge over Mississippi River on Road
Destroyed by flooding

RI - Colona Covered Bridge (Henry County, Illinois)
Built 1853
Lost Through truss bridge over Rock River on Chicago, Rock Island & Pacific Railroad
Replaced by a new bridge