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WB US 20 over Buffalo Creek

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

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

WB US 20 over Buffalo Creek in Buchanan 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 1978, making it 47 years old at the 2025 inventory.
It carries about 3,500 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 161 of the 320 inventoried bridges in Buchanan County rated fair (50.3%); 20 (6.2%) 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 305 ft
Location	2.3 Mi. E of Jct. SR W40
NBI structure number	000000000603665
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I-380 over Mud Creek	1983	17,700	Good
US 20 over Drainage Ditch	1980	10,700	Good
1ST St W over Wapsipinicon River	1917	10,258	Fair
US 20 over Drainage Ditch	1980	10,100	Good
US 20 over Drainage Ditch	1980	10,100	Fair
Ia 150 over Wapsipinicon River	1927	9,000	Fair