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Ia 37 over Mill Creek

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

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

Ia 37 over Mill Creek in Shelby 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 5 (fair condition) on the 0-9 scale.
It was built in 1992, making it 33 years old at the 2025 inventory.
It carries about 630 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 111 of the 207 inventoried bridges in Shelby County rated fair (53.6%); 18 (8.7%) 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 200 ft
Location	3.7 E OF Jct. US 30
NBI structure number	000000000047851
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 59 over Drainage Ditch	1966	5,000	Fair
US 59 over Drainage Ditch	1970	4,940	Fair
US 59 over West Nishnabotna River	1970	4,940	Fair
US 59 over Jensen Creek	1968	4,680	Fair
Ia 44 over West Nishnabotna River	1978	3,960	Fair
US 59 over Lyon Creek	1970	3,240	Fair