US Bridges

IRR - S 344 over Sheep Creek

FairPosted for load

Roosevelt County, Montana · 1M W Froid · Structure no. S00344035+00341

Built
1956
69 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
52 ft
2 main spans
Daily traffic
197
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - S 344 over Sheep Creek is a wood or timber stringer/multi-beam or girder carrying IRR - S 344 over Sheep Creek in Roosevelt County, Montana. It was built in 1956, so it is 69 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. Its operating status is: posted for load restriction.

It carries about 197 vehicles a day, roughly 10% of them trucks, projected to reach 207 by 2043. The structure is 52 ft (15.7 m) long and 26 ft wide. If it were closed, the detour would be 65.9 mi (106 km).

Location

Open in Google Maps
CarriesIRR - S 344
CrossesSheep Creek
Location1M W Froid
RouteState Highway 344
CountyRoosevelt County
StateMontana
Coordinates48.33878, -104.51344
Functional classRural Major Collector

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating33 US tons
Inventory rating19 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 15
Structure length52 ft (15.7 m)
Longest span25 ft (7.6 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic197 (2023)
Projected traffic207 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed65.9 mi (106 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 344 over Sheep Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is IRR - S 344 over Sheep Creek 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 October 2023.

How much traffic does IRR - S 344 over Sheep Creek carry?

About 197 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is IRR - S 344 over Sheep Creek?

The structure is 52 ft (15.7 m) long with a longest span of 25 ft (7.6 m) and a deck 26 ft wide.

Who owns IRR - S 344 over Sheep Creek?

It is owned by the State Highway Agency.