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155TH St over Silver Creek

Clinton County, Iowa · rated Good in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

155TH St over Silver Creek in Clinton County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 9 (excellent condition) on the 0-9 scale.
It was built in 2012, making it 13 years old at the 2025 inventory.
It carries about 91 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 261 of the 375 inventoried bridges in Clinton County rated good (69.6%); 12 (3.2%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 69 ft
Location	083e73105
NBI structure number	000000000126012
Condition class	Good

Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.

Bridge	Built	Vehicles/day	Condition
US 61 over Dd #15	1981	17,600	Good
US 30 & 67 over Mill Creek	2000	17,300	Fair
US 30 & US 67 over over UPRR	2000	17,200	Good
US 67 over over UP RR	1978	11,200	Fair
US 30 over Mississippi Rvr RR S 2ND	1956	11,100	Fair
Ia 136 over Mississippi River & RR	1974	11,000	Fair