US Bridges

S Shiloh RD over Bbwa Canal

Fair

Yellowstone County, Montana · 2M W Billings · Structure no. S00429003+03271

Built
2000
25 years old
Condition
Fair
inspected December 2024
Type
Tee Beam
Prestressed Concrete
Length
55 ft
1 main span
Daily traffic
12,688
2023 count
Owner
County
County Highway Agency

About this bridge

S Shiloh RD over Bbwa Canal is a prestressed concrete tee beam carrying S Shiloh RD over Bbwa Canal in Yellowstone County, Montana. It was built in 2000, so it is 25 years old, younger 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 12,688 vehicles a day, roughly 1% of them trucks, projected to reach 13,893 by 2043. The structure is 55 ft (16.7 m) long and 82 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesS Shiloh RD
CrossesBbwa Canal
Location2M W Billings
RouteCity Street 116
StateMontana
Coordinates45.73986, -108.61742
Functional classUrban Other Principal Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating50 US tons
Inventory rating39 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length55 ft (16.7 m)
Longest span52 ft (15.7 m)
Deck width82 ft (25.1 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,688 (2023)
Projected traffic13,893 by 2043
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes

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 S Shiloh RD over Bbwa Canal built?

It was built in 2000, making it 25 years old in 2025.

What condition is S Shiloh RD over Bbwa Canal 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 December 2024.

How much traffic does S Shiloh RD over Bbwa Canal carry?

About 12,688 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is S Shiloh RD over Bbwa Canal?

The structure is 55 ft (16.7 m) long with a longest span of 52 ft (15.7 m) and a deck 82 ft wide.

Who owns S Shiloh RD over Bbwa Canal?

It is owned by the County Highway Agency.