US Bridges

S 200 over Box Elder Creek

Fair

Petroleum County, Montana · 8M E Winnett · Structure no. P00057145+03141

Built
1953
72 years old
Condition
Fair
inspected April 2024
Type
Tee Beam
Concrete
Length
184 ft
4 main spans
Daily traffic
539
2023 count
Owner
State
State Highway Agency

About this bridge

S 200 over Box Elder Creek is a concrete tee beam carrying S 200 over Box Elder Creek in Petroleum County, Montana. It was built in 1953, so it is 72 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 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 539 vehicles a day, roughly 13% of them trucks, projected to reach 566 by 2043. The structure is 184 ft (56.1 m) long and 31 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesS 200
CrossesBox Elder Creek
Location8M E Winnett
RouteState Highway 200
StateMontana
Coordinates47.01255, -108.15602
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating29.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length184 ft (56.1 m)
Longest span45 ft (13.7 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic539 (2023)
Projected traffic566 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$509,000
NavigationNo navigation control on waterway

Frequently asked questions

When was S 200 over Box Elder Creek built?

It was built in 1953, making it 72 years old in 2025.

What condition is S 200 over Box Elder 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 April 2024.

How much traffic does S 200 over Box Elder Creek carry?

About 539 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is S 200 over Box Elder Creek?

The structure is 184 ft (56.1 m) long with a longest span of 45 ft (13.7 m) and a deck 31 ft wide.

Who owns S 200 over Box Elder Creek?

It is owned by the State Highway Agency.