US Bridges

Neibauer RD over Bbwa Canal 037

Fair

Yellowstone County, Montana · 7M NE Laurel · Structure no. L56505000+06001

Built
1977
48 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
2,850
2023 count
Owner
County
County Highway Agency

About this bridge

Neibauer RD over Bbwa Canal 037 is a steel stringer/multi-beam or girder carrying Neibauer RD over Bbwa Canal 037 in Yellowstone County, Montana. It was built in 1977, so it is 48 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 2,850 vehicles a day, roughly 3% of them trucks, projected to reach 3,035 by 2043. The structure is 40 ft (12.2 m) long and 48 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesNeibauer RD
CrossesBbwa Canal 037
Location7M NE Laurel
RouteCounty Highway 56505
CountyYellowstone County
StateMontana
Coordinates45.72617, -108.64138
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span37 ft (11.3 m)
Deck width48 ft (14.7 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,850 (2023)
Projected traffic3,035 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Neibauer RD over Bbwa Canal 037 built?

It was built in 1977, making it 48 years old in 2025.

What condition is Neibauer RD over Bbwa Canal 037 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 January 2025.

How much traffic does Neibauer RD over Bbwa Canal 037 carry?

About 2,850 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Neibauer RD over Bbwa Canal 037?

The structure is 40 ft (12.2 m) long with a longest span of 37 ft (11.3 m) and a deck 48 ft wide.

Who owns Neibauer RD over Bbwa Canal 037?

It is owned by the County Highway Agency.