Home › Iowa › Cerro Gordo County › 310TH St over Stream

310TH St over Stream

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

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

310TH St over Stream in Cerro Gordo 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 9 (excellent condition) on the 0-9 scale.
It was built in 2021, making it 4 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 119 of the 268 inventoried bridges in Cerro Gordo County rated good (44.4%); 14 (5.2%) 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 January 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
Culvert	9	9	Excellent condition


Structure	Concrete culvert
Length	about 21 ft
Location	24000 block of 310th St.
NBI structure number	000000000366625
Condition class	Good
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	January 2024
Inspection interval (item 91)	24 months
Scour (item 113)	7: scour countermeasures installed

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

Bridge	Built	Vehicles/day	Condition
I-35 over Calmus Creek	1970	21,400	Fair
Ia 122 over Cheslea Creek	2010	18,800	Good
I-35 over Drainage Ditch	1972	18,100	Good
I-35 over Drainage Ditch	1972	17,700	Fair
I-35 over Drainage Ditch	1971	17,600	Fair
I 35 over Drainage Ditch	1972	17,600	Fair