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N3630 over Brushy Creek

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

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

N3630 over Brushy Creek in Johnston County, Oklahoma, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 2012, making it 13 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 94 of the 154 inventoried bridges in Johnston County rated fair (61.0%); 6 (3.9%) 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 60 ft
Location	.4 S of Milburn
NBI structure number	306010000000000
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
S.H. 22 over Pennington Creek	1954	7,000	Fair
S.H. 22 over Sand Creek	1964	4,100	Good
S.H. 22 over Rock Creek	1964	3,700	Fair
S.H. 22 over Little Sandy Creek	1975	3,700	Fair
S.H. 22 over Big Sandy Creek	1975	3,700	Fair
S.H. 199 over Camp Creek	1959	3,500	Fair