Home › Oklahoma › Marshall County › Irr 4820C over Creek

Irr 4820C over Creek

Marshall County, Oklahoma · rated Good in the 2025 National Bridge Inventory

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

Irr 4820C over Creek in Marshall County, Oklahoma, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
It was built in 1992, making it 33 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 41 of the 79 inventoried bridges in Marshall County rated good (51.9%); 9 (11.4%) are rated poor.
Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
Its condition class and component ratings are unchanged from the 2024 inventory.
Its most recent inspection on record is dated October 2023, on a 24-month routine inspection cycle.
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

Component	Rating (2024)	Rating (2025)	FHWA scale meaning
Culvert	7	7	Good condition


Structure	Concrete culvert
Length	about 25 ft
Location	1.0 S 1.0 W Mc Millan
NBI structure number	229650000000000
Condition class	Good
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	October 2023
Inspection interval (item 91)	24 months
Scour (item 113)	8: foundations stable, scour above the top of the footing

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

Bridge	Built	Vehicles/day	Condition
U.S. 70 over Whiskey Creek	1933	10,200	Fair
S.H. 199 over Glasses Creek	1960	8,600	Fair
S.H. 99 over Whiskey Creek	1960	6,700	Fair
U.S. 70 over Little Glasses Creek	1946	6,300	Fair
U.S. 70 over Creek	1958	6,300	Good
U.S. 70 over Creek	1935	6,200	Good