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S.H. 56 over I-40 Under

Seminole County, Oklahoma · rated Fair in the 2025 National Bridge Inventory

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

S.H. 56 over I-40 Under in Seminole County, Oklahoma, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 2007, making it 18 years old at the 2025 inventory.
It carries about 950 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 154 of the 298 inventoried bridges in Seminole County rated fair (51.7%); 36 (12.1%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 297 ft
Location	Jct I-40/S.H. 56
NBI structure number	288080000000000
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I-40 over Creek	1963	15,100	Fair
I-40 over Creek	1963	15,100	Fair
I-40 over Creek	1964	14,800	Good
S.H. 99 over Magnolia Creek	1965	14,400	Good
Old U.S. 270 over Magnolia Creek	2020	10,400	Good
S.H. 9 over Carter Creek	2011	10,000	Fair