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Hills Mill Rd over Boulder Creek

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

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

Hills Mill Rd over Boulder Creek in Linn 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 2003, making it 22 years old at the 2025 inventory.
It carries about 20 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 295 of the 511 inventoried bridges in Linn County rated fair (57.7%); 34 (6.7%) 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

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

Bridge	Built	Vehicles/day	Condition
I-380 over E and F Ave NW Cedar Rvr	1979	57,600	Fair
SB I-380 over Cc RR & Ash Pit	1979	41,000	Fair
NB I-380 over Cc RR	1980	38,800	Fair
SB I-380 over Cc RR	1980	38,800	Fair
NB I-380 over H Ave NE	1980	38,800	Fair
SB I-380 over H Ave NE	1980	38,800	Good