US Bridges

Main ST over Mcdonald Creek 015

FairPosted for load

Petroleum County, Montana · Winnett-Main ST · Structure no. M35125000+00101

Built
1940
85 years old
Condition
Fair
inspected August 2024
Type
Truss - Thru
Steel
Length
52 ft
1 main span
Daily traffic
64
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Main ST over Mcdonald Creek 015 is a steel truss - thru carrying Main ST over Mcdonald Creek 015 in Petroleum County, Montana. It was built in 1940, so it is 85 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 64 vehicles a day, roughly 3% of them trucks, projected to reach 68 by 2043. The structure is 52 ft (15.8 m) long and 18 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesMain ST
CrossesMcdonald Creek 015
LocationWinnett-Main ST
RouteCity Street 35125
CountyPetroleum County
StateMontana
Coordinates47.00402, -108.34534
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating8 US tons
Inventory rating6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length52 ft (15.8 m)
Longest span50 ft (15.2 m)
Deck width18 ft (5.5 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic64 (2023)
Projected traffic68 by 2043
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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$161,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Main ST over Mcdonald Creek 015 built?

It was built in 1940, making it 85 years old in 2025.

What condition is Main ST over Mcdonald Creek 015 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 Main ST over Mcdonald Creek 015 carry?

About 64 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Main ST over Mcdonald Creek 015?

The structure is 52 ft (15.8 m) long with a longest span of 50 ft (15.2 m) and a deck 18 ft wide.

Who owns Main ST over Mcdonald Creek 015?

It is owned by the City or Municipal Highway Agency.