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N3420 over Sweetwater Creek

Kay County, Oklahoma · rated Poor in the 2025 National Bridge Inventory

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

N3420 over Sweetwater Creek in Kay County, Oklahoma, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1940, making it 85 years old at the 2025 inventory.
It carries about 100 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 22 of the 419 inventoried bridges in Kay County rated poor (5.3%); 22 (5.3%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 48 ft
Location	8.2E .4S of Newkirk
NBI structure number	087320000000000
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
I-35 over Salt Fk Ark Rvr Oflow	1959	17,500	Good
I-35 over Salt Fk Ark Rvr Oflow	1962	17,500	Fair
I-35 over Salt Fk Ark Rvr Oflow	1962	17,500	Fair
I-35 over Creek	1959	15,700	Fair
I-35 over Creek	1960	15,500	Fair
I-35 over Dry Creek	1959	14,300	Fair