Home › Montana › McCone County › S 13 over Drainage

S 13 over Drainage

McCone County, Montana · rated Good in the 2025 National Bridge Inventory

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

S 13 over Drainage in McCone County, Montana, 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 1994, making it 31 years old at the 2025 inventory.
It carries about 901 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 5 of the 43 inventoried bridges in McCone County rated good (11.6%); 4 (9.3%) 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 March 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	Steel culvert
Length	about 29 ft
Location	4M N Vida
NBI structure number	P00025034+01771
Condition class	Good
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	March 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 Montana department of transportation.

Bridge	Built	Vehicles/day	Condition
S 200 over Redwater River	1933	1,263	Fair
Irr - S 13 over Drainage	1995	985	Fair
Irr - S 13 over Drainage-stockpass	1995	985	Good
Irr - S 13 over Nickwall Creek	1995	985	Fair
S 200S over Buffalo Spring Creek	1966	971	Fair
S 13 over Horse Creek	1988	910	Fair