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D35 over US 20

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

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

D35 over US 20 in Hardin 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 7 (good condition) on the 0-9 scale.
It was built in 2003, making it 22 years old at the 2025 inventory.
It carries about 717 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 87 of the 241 inventoried bridges in Hardin County rated good (36.1%); 69 (28.6%) are rated poor.
Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
Its condition class and component ratings are unchanged from the 2024 inventory.
Its most recent inspection on record is dated August 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

Component	Rating (2024)	Rating (2025)	FHWA scale meaning
Deck	7	7	Good condition
Superstructure	9	9	Excellent condition
Substructure	9	9	Excellent condition


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 224 ft
Location	at Junction SR D35
NBI structure number	000000000607885
Condition class	Good
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	August 2024
Inspection interval (item 91)	24 months
Scour (item 113)	N: not over a waterway

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

Bridge	Built	Vehicles/day	Condition
US 20 over Drainage	2003	9,800	Good
US 20 over Drainage	2003	9,200	Good
US 20 over Iowa River	2003	9,200	Good
US 65 over Iowa River	2011	7,800	Good
Washington St over Iowa River	1934	6,251	Fair
US 65 over Beaver Creek	1976	5,300	Good