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SB I-35 over Buffalo Creek

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

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

SB I-35 over Buffalo Creek in Franklin 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 1973, making it 52 years old at the 2025 inventory.
It carries about 8,450 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 103 of the 227 inventoried bridges in Franklin County rated good (45.4%); 28 (12.3%) are rated poor.
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	Prestressed concrete stringer or multi-beam girder
Length	about 159 ft
Location	0.5 mi. N of SR C25
NBI structure number	000000000602468
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I-35 over Drainage Ditch	1972	17,300	Good
I-35 over Drainage Ditch	1973	17,000	Good
I-35 over Drainage Ditch	1972	16,900	Fair
I-35 over Stream	1974	15,300	Fair
I-35 over Drainage Ditch NO.48	1974	15,100	Good
NB I-35 over Buffalo Creek	1973	8,600	Good