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US 18 & Ia 346 over U.S. 63

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

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

US 18 & Ia 346 over U.S. 63 in Chickasaw 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 7 (good condition) on the 0-9 scale.
It was built in 2002, making it 23 years old at the 2025 inventory.
It carries about 4,130 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 126 of the 304 inventoried bridges in Chickasaw County rated good (41.4%); 80 (26.3%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 273 ft
Location	At E Jct. U.S. 63
NBI structure number	000000000606925
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US 63 over Trib to Wapsipinicon	2001	5,100	Good
Ia 24 over Plum Creek	2000	4,290	Good
US 63 over E. Fk Wapsipinicon River	1962	4,280	Fair
US 63 over Spring Creek	1971	4,280	Fair
Ia 346 over Cedar River	1984	3,340	Fair
US 18 over East Wapsipinicon River	1983	3,150	Fair