US Bridges

IRR - S 251 over Smoke Creek

PoorPosted for load

Daniels County, Montana · 11M S Flaxville · Structure no. S00251040+09001

Built
1954
71 years old, rebuilt 1967
Condition
Poor
inspected August 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
26 ft
1 main span
Daily traffic
101
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - S 251 over Smoke Creek is a wood or timber stringer/multi-beam or girder carrying IRR - S 251 over Smoke Creek in Daniels County, Montana. It was built in 1954 and reconstructed in 1967, so it is 71 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 101 vehicles a day, roughly 10% of them trucks, projected to reach 106 by 2043. The structure is 26 ft (7.9 m) long and 33 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesIRR - S 251
CrossesSmoke Creek
Location11M S Flaxville
RouteState Highway 251
StateMontana
Coordinates48.63996, -105.16987
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41 US tons
Inventory rating27 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 15
Structure length26 ft (7.9 m)
Longest span25 ft (7.6 m)
Deck width33 ft (10.2 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic101 (2023)
Projected traffic106 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 251 over Smoke Creek built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 1967.

What condition is IRR - S 251 over Smoke Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does IRR - S 251 over Smoke Creek carry?

About 101 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is IRR - S 251 over Smoke Creek?

The structure is 26 ft (7.9 m) long with a longest span of 25 ft (7.6 m) and a deck 33 ft wide.

Who owns IRR - S 251 over Smoke Creek?

It is owned by the State Highway Agency.