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EB US 30 over S 6TH Ave

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

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

EB US 30 over S 6TH Ave in Clinton County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1970, making it 55 years old at the 2025 inventory.
It carries about 3,650 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 102 of the 375 inventoried bridges in Clinton County rated fair (27.2%); 12 (3.2%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 175 ft
Location	1.5 Mi. E of E Jct. US 61
NBI structure number	000000000602800
Condition class	Fair

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