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Birch Avenue over Sin Creek

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

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

Birch Avenue over Sin Creek in Adams County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1964, making it 61 years old at the 2025 inventory.
It carries about 5 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 85 of the 185 inventoried bridges in Adams County rated poor (45.9%); 85 (45.9%) 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

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

Bridge	Built	Vehicles/day	Condition
Ia 148 over East Nodaway River	1976	3,580	Fair
Ia 148 over over BNSF RR	1976	3,580	Good
US 34 over E Nodaway River & BNSF R	1964	2,970	Fair
US 34 over Metz Creek	1921	2,390	Fair
US 34 over Platte River	2014	2,390	Good
US 34 over Kemp Creek	1964	2,240	Fair