US Bridges

N 27th ST over Bbwa Canal

Fair

Yellowstone County, Montana · Billings-N 27th ST · Structure no. P00053002+01251

Built
1947
78 years old, rebuilt 1963
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
38 ft
1 main span
Daily traffic
6,888
2023 count
Owner
State
State Highway Agency

About this bridge

N 27th ST over Bbwa Canal is a wood or timber stringer/multi-beam or girder carrying N 27th ST over Bbwa Canal in Yellowstone County, Montana. It was built in 1947 and reconstructed in 1963, so it is 78 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 6,888 vehicles a day, roughly 5% of them trucks, projected to reach 7,232 by 2043. The structure is 38 ft (11.6 m) long and 73 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN 27th ST
CrossesBbwa Canal
LocationBillings-N 27th ST
RouteState Highway 3
CountyYellowstone County
StateMontana
Coordinates45.79637, -108.518
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating24 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length38 ft (11.6 m)
Longest span37 ft (11.3 m)
Deck width73 ft (22.1 m)
Roadway width64 ft (19.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,888 (2023)
Projected traffic7,232 by 2043
Trucks5%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 N 27th ST over Bbwa Canal built?

It was built in 1947, making it 78 years old in 2025. It was reconstructed in 1963.

What condition is N 27th ST 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 October 2024.

How much traffic does N 27th ST over Bbwa Canal carry?

About 6,888 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is N 27th ST over Bbwa Canal?

The structure is 38 ft (11.6 m) long with a longest span of 37 ft (11.3 m) and a deck 73 ft wide.

Who owns N 27th ST over Bbwa Canal?

It is owned by the State Highway Agency.