US Bridges

17th ST W over Bbwa Canal

Good

Yellowstone County, Montana · BILLINGS-17th ST W · Structure no. U01003000+04501

Built
1974
51 years old
Condition
Good
inspected November 2024
Type
Tee Beam
Prestressed Concrete
Length
46 ft
1 main span
Daily traffic
9,172
2023 count
Owner
County
County Highway Agency

About this bridge

17th ST W over Bbwa Canal is a prestressed concrete tee beam carrying 17th ST W over Bbwa Canal in Yellowstone County, Montana. It was built in 1974, so it is 51 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 9,172 vehicles a day, projected to reach 9,631 by 2043. The structure is 46 ft (14 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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Carries17th ST W
CrossesBbwa Canal
LocationBILLINGS-17th ST W
RouteCity Street 1003
CountyYellowstone County
StateMontana
Coordinates45.79092, -108.55907
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating33 US tons
Inventory rating16 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length46 ft (14 m)
Longest span45 ft (13.7 m)
Deck width60 ft (18.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,172 (2023)
Projected traffic9,631 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 17th ST W over Bbwa Canal built?

It was built in 1974, making it 51 years old in 2025.

What condition is 17th ST W over Bbwa Canal in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.

How much traffic does 17th ST W over Bbwa Canal carry?

About 9,172 vehicles per day (2023 count).

How long is 17th ST W over Bbwa Canal?

The structure is 46 ft (14 m) long with a longest span of 45 ft (13.7 m) and a deck 60 ft wide.

Who owns 17th ST W over Bbwa Canal?

It is owned by the County Highway Agency.