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N3920 over Flat Rock Creek

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

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

N3920 over Flat Rock Creek in Okmulgee 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 1997, making it 28 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 153 of the 311 inventoried bridges in Okmulgee County rated fair (49.2%); 54 (17.4%) 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	Prestressed concrete tee beam
Length	about 109 ft
Location	2.5 W; 0.5 S Preston
NBI structure number	251160000000000
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
U.S. 75 over Negro Creek	1957	18,900	Fair
U.S. 75 over Eagle Creek	1957	18,500	Fair
U.S. 75 over Adams Creek	1957	18,000	Fair
U.S. 75 over Flat Rock Creek	1957	17,500	Fair
I-40 over Coal Creek	1963	16,000	Fair
U.S. 62/US 75 SB over Burgess Creek	2017	16,000	Good