Another massive bridge crosses the Wisconsin River near Spring Green.
Built of a mish-mash of spans, the bridge is one of the longest and most unusual over the Wisconsin River.
The previous bridge here used several 1886 truss spans, one of which was known to have been moved to Dunnville, Wisconsin. The bridge was altered in 1927, 1928, 1942 and 2017, putting it in the current configuration, which is as follows:
30 span steel stringer (built 2017)
2-112'6" 5-panel, pin connected Pratt through trusses (built 1895 and moved here 1927)
205' pin connected Pratt through truss swing span (built 1899, strengthened 1937)
2-52'6" through plate girders (built 1927)
1-68' deck plate girder (built 1942)
2-70' deck plate girders (built 1942)
1-75' deck plate girder (built 1927)
1-60' deck plate girder (built 1927)
4 span steel stringer (built 2017)
The substructures on this bridge are constructed of stone, concrete and steel piles.
The two 1895 trusses were fabricated by Lassig Bridge & Iron Works at an unknown location. Identical spans were reused at Merrill, Wisconsin in 1929 and at Jefferson, Iowa in 1930. It is likely that these spans are all related, possibly from the same line.
The 75' and 60' girders each had blueprints at the Milwaukee Road Archives at the Milwaukee Public Library. It is unknown if these are the same spans. The blueprints indicate that the 75' deck girder was altered from an 80' deck girder originally built at Bridge #Z-284 (Kilbuck Creek; west of Monroe Center, Illinois) in 1883, and moved here 1905. The 60' deck girder bridge was converted to a skew span as well, and was originally built at Bridge #I-1090 (Skunk River; Rubio, Iowa) in 1901 before being moved here in 1905. It is unknown if the 1928 rebuild of these spans reused the older steel.
In 2017, original timber west approach and east jump spans would be replaced by modern I-Beam spans on steel piles. These upgrades have brought the bridge to its present configuration.
Overall, the bridge appears to be in fair condition. The trusses are exceptionally light for the traffic this bridge carries, and may be a replacement candidate in the coming years. The swing span has not operated in many years.
The author has ranked this bridge as being regionally significant, due to the unique design and history.
The photo above is an overview from the east bank. The photo below is a photo of a plaque.
| Upstream | Sauk City Bridge (West) |
| Upstream East Channel | Sauk City Bridge (East) |
| Downstream | Lone Rock Rail Bridge |
