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1940 Deer Ave over Boone River

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

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

1940 Deer Ave over Boone River in Hancock County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
It was built in 1967, making it 58 years old at the 2025 inventory.
It carries about 26 vehicles a day (traffic count year 2021).
Its listed owner is the county highway agency.
It is one of 27 of the 135 inventoried bridges in Hancock County rated poor (20.0%); 27 (20.0%) 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	Timber stringer or multi-beam girder
Length	about 58 ft
Location	095261502
NBI structure number	000000000173600
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
US 18 over E Branch Iowa River	2002	6,500	Good
US 18 over Drainage Ditch	1958	5,200	Fair
US 18 over West Fork Iowa River	1958	5,200	Fair
B-14 over Private Dr	1972	3,502	Fair
US 18 over Boone River	1959	2,980	Fair
US 18 over Branch Boone River	1959	2,980	Fair