| Name | Location | Status | Design | Year Built | Year Lost | Span Length | Total Length |
|---|
| Buffalo Creek Bridge | Local road over Buffalo Creek | Open to traffic | Arch | 1945 | -- | 16.1 ft. | 43.0 ft. |
| Fiddle Creek Bridge | Local road over Fiddle Creek | Open to traffic | Pony truss | 1915 | -- | 40.0 ft. | 43.0 ft. |
| Fiddle Creek Bridge | Local road over Fiddle Creek | Open to traffic | Pony truss | 1917 | -- | 44.9 ft. | 47.9 ft. |
| Grey Creek Bridge | Local road over Grey Creek | Open to traffic | Pony truss | 1927 | -- | 44.9 ft. | 47.9 ft. |
| Grey Creek Bridge | Local road over Grey Creek | Open to traffic | Pony truss | ca. 1920 | -- | 49.9 ft. | 53.2 ft. |
| Maple River Bridge | Local road over Maple River | Open to traffic | Pony truss | 1921 | -- | 65.0 ft. | 67.9 ft. |
| Maple River Bridge | Local road over Maple River | Open to traffic | Pony truss | -- | -- | 80.1 ft. | 141.1 ft. |
| Maple River Bridge | Local road over Maple River | No longer exists | Pony truss | 1921 | 2001 | 60.0 ft. | 107.0 ft. |
| Maple River Bridge | Local road over Maple River | Open to traffic | Pony truss | 1948 | -- | 89.9 ft. | 171.9 ft. |
| Maple River Bridge | Local road over Maple River | Open to traffic | Pony truss | 1918 | -- | 65.0 ft. | 67.9 ft. |
| Maple River Bridge | Local road over Maple River | Open to traffic | Pony truss | 1919 | -- | 65.0 ft. | 67.9 ft. |
| Maple River Bridge | Local road over Maple River | Open to traffic | Pony truss | -- | -- | 49.9 ft. | 54.1 ft. |
| Mill Creek Bridge | Old IA 21 over Mill Creek | Open to traffic | Pratt through truss | 1891 | -- | 128.0 ft. | 207.0 ft. |
| Mill Creek Bridge | Local road over Mill Creek | Open to traffic | Through truss | 1917 | -- | 100.1 ft. | 103.0 ft. |
| Mill Creek Bridge | Local road over Mill Creek | Open to traffic | Through truss | 1891 | -- | 95.1 ft. | 151.9 ft. |
| Perry Creek Bridge | Local road over Perry Creek | Open to traffic | Pony truss | 1948 | -- | 65.9 ft. | 69.9 ft. |
| Perry Creek Bridge | Local road over Perry Creek | Open to traffic | Pony truss | 1935 | -- | 60.0 ft. | 91.9 ft. |
| Rock Creek Bridge | Local road over Rock Creek | Open to traffic | Pony truss | 1900 | -- | 49.9 ft. | 52.2 ft. |
| Rock Creek Bridge | Local road over Rock Creek | Closed to all traffic | Pony truss | -- | -- | 38.0 ft. | 41.0 ft. |
| Rock Creek Bridge | Local road over Rock Creek | Open to traffic | Pony truss | 1917 | -- | 40.0 ft. | 43.0 ft. |
| Silver Creek Bridge | Local road over Silver Creek | Open to traffic | Pony truss | 1915 | -- | 44.9 ft. | 124.0 ft. |
| Silver Creek Bridge | Local road over Silver Creek | Open to traffic | Pony truss | 1916 | -- | 49.9 ft. | 94.2 ft. |
| Sleepy Hollow Bridge | Local road over Sleepy Hollow | Open to traffic | Pony truss | 1915 | -- | 60.0 ft. | 63.0 ft. |
| Unnamed Creek Bridge | Local road over Unnamed creek | Open to traffic | Pony truss | 1915 | -- | 40.0 ft. | 43.0 ft. |
| Unnamed Creek Bridge | Local road over Unnamed creek | Open to traffic | Arch | 1941 | -- | 16.1 ft. | 44.0 ft. |
| West Fork Little Sioux River Bridge | Local road over West Fork Little Sioux River | Open to traffic | Pony truss | 1916 | -- | 49.9 ft. | 53.2 ft. |
| West Fork Little Sioux River Bridge | Local road over West Fork Little Sioux River | Open to traffic | Pony truss | 1939 | -- | 60.0 ft. | 62.0 ft. |