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FM over Blackhawk Creek

Grundy County, Iowa · rated Poor in the 2025 National Bridge Inventory

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

FM over Blackhawk Creek in Grundy County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
It was built in 1967, making it 58 years old at the 2025 inventory.
It carries about 579 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 77 of the 288 inventoried bridges in Grundy County rated poor (26.7%); 77 (26.7%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Continuous steel stringer or multi-beam girder
Length	about 178 ft
Location	087161304
NBI structure number	000000000164160
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
US 20 over Stream	1999	14,500	Good
US 20 over Stream	1999	13,500	Good
US 20 over Stream	1999	8,800	Good
US 20 WB over Grundy Rd	2000	6,800	Good
US 20 EB over Grundy Rd	2000	6,800	Good
US 20 WB over Stream	2000	6,800	Good