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250TH St over Allen Creek

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

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

250TH St over Allen Creek in Harrison 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 1965, making it 60 years old at the 2025 inventory.
It carries about 11 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 41 of the 222 inventoried bridges in Harrison County rated poor (18.5%); 41 (18.5%) 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	Steel stringer or multi-beam girder
Length	about 60 ft
Location	079442301
NBI structure number	000000000178310
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
US 30 over Willow Creek	1972	10,300	Fair
US 30 over UPRR	1998	10,300	Good
NB I-29 over Boyer River	1958	10,050	Fair
SB I-29 over Boyer River	1958	10,050	Fair
SB I-29 over over UP RR	1967	7,750	Fair
NB I-29 over Allen Creek	1967	7,750	Fair