US Bridges

IRR - S 13 over Midway Coulee

Fair

Roosevelt County, Montana · 21M S Scobey · Structure no. P00032030+00701

Built
1932
93 years old, rebuilt 1976
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
58 ft
3 main spans
Daily traffic
229
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - S 13 over Midway Coulee is a wood or timber stringer/multi-beam or girder carrying IRR - S 13 over Midway Coulee in Roosevelt County, Montana. It was built in 1932 and reconstructed in 1976, so it is 93 years old, older 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 5 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 229 vehicles a day, roughly 11% of them trucks, projected to reach 240 by 2043. The structure is 58 ft (17.7 m) long and 27 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesIRR - S 13
CrossesMidway Coulee
Location21M S Scobey
RouteState Highway 13
CountyRoosevelt County
StateMontana
Coordinates48.48928, -105.43044
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating26 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 15
Structure length58 ft (17.7 m)
Longest span19 ft (5.8 m)
Deck width27 ft (8.3 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic229 (2023)
Projected traffic240 by 2043
Trucks11%
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 Midway Coulee built?

It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1976.

What condition is IRR - S 13 over Midway 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 August 2024.

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

About 229 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is IRR - S 13 over Midway Coulee?

The structure is 58 ft (17.7 m) long with a longest span of 19 ft (5.8 m) and a deck 27 ft wide.

Who owns IRR - S 13 over Midway Coulee?

It is owned by the State Highway Agency.