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FM over Small Stream

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

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

FM over Small Stream in Grundy County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
It was built in 1999, making it 26 years old at the 2025 inventory.
It carries about 69 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 120 of the 288 inventoried bridges in Grundy County rated good (41.7%); 77 (26.7%) 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 April 2023, on a 48-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
Culvert	7	7	Good condition


Structure	Continuous concrete culvert
Length	about 22 ft
Location	088160302
NBI structure number	000000000607705
Condition class	Good
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	April 2023
Inspection interval (item 91)	48 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 20 over Stream	1999	14,500	Good
US 20 over Stream	1999	13,500	Good
US 20 over Stream	1999	8,800	Good
US 20 WB over Grundy Rd	2000	6,800	Good
US 20 EB over Grundy Rd	2000	6,800	Good
US 20 WB over Stream	2000	6,800	Good