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1780 Hill Ave over Trib Boone River #8

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

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

1780 Hill Ave over Trib Boone River #8 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 4 (poor condition) on the 0-9 scale.
It was built in 1957, making it 68 years old at the 2025 inventory.
It carries about 15 vehicles a day (traffic count year 2022).
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	Prestressed concrete stringer or multi-beam girder
Length	about 57 ft
Location	095252902
NBI structure number	000000000173450
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