US Bridges

IRR - S 13 over Gady Coulee

Fair

McCone County, Montana · 5M N Vida · Structure no. P00025035+04231

Built
1994
31 years old
Condition
Fair
inspected March 2023
Type
Culvert
Steel
Length
26 ft
2 main spans
Daily traffic
905
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - S 13 over Gady Coulee is a steel culvert carrying IRR - S 13 over Gady Coulee in McCone County, Montana. It was built in 1994, so it is 31 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 905 vehicles a day, roughly 17% of them trucks, projected to reach 950 by 2043. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesIRR - S 13
CrossesGady Coulee
Location5M N Vida
RouteState Highway 13
CountyMcCone County
StateMontana
Coordinates47.91252, -105.49664
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89 US tons
Inventory rating89 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHL 93
Structure length26 ft (7.9 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic905 (2023)
Projected traffic950 by 2043
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR - S 13 over Gady Coulee built?

It was built in 1994, making it 31 years old in 2025.

What condition is IRR - S 13 over Gady Coulee in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2023.

How much traffic does IRR - S 13 over Gady Coulee carry?

About 905 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is IRR - S 13 over Gady Coulee?

The structure is 26 ft (7.9 m) long with a longest span of 11 ft (3.4 m).

Who owns IRR - S 13 over Gady Coulee?

It is owned by the State Highway Agency.