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Lark Ave over Nishnabotna River

Audubon County, Iowa · rated Good in the 2025 National Bridge Inventory

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

Lark Ave over Nishnabotna River in Audubon County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 9 (excellent condition) on the 0-9 scale.
It was built in 2022, making it 3 years old at the 2025 inventory.
It carries about 60 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 71 of the 204 inventoried bridges in Audubon County rated good (34.8%); 37 (18.1%) are rated poor.
Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
It does not appear under this structure number in the 2024 inventory (a new or renumbered structure).
Its most recent inspection on record is dated July 2024, on a 24-month routine inspection cycle.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Continuous concrete slab
Length	about 152 ft
Location	080351104
NBI structure number	000000000366810
Condition class	Good
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	July 2024
Inspection interval (item 91)	24 months
Scour (item 113)	8: foundations stable, scour above the top of the footing

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

Bridge	Built	Vehicles/day	Condition
US 71 over Stream	1983	3,700	Good
US 71 over Bluegrass Creek	2006	3,080	Good
US 71 over East Nishnabotna River	1959	2,470	Fair
US 71 over Stream	1923	2,380	Fair
US 71 over Stream	1961	2,380	Fair
US 71 over Stream	1961	2,380	Fair