US Bridges

Monad RD over Bbwa Canal 151

Good

Yellowstone County, Montana · Billings-Monad RD · Structure no. M56010000+00801

Built
1986
39 years old
Condition
Good
inspected November 2024
Type
Tee Beam
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
7,121
2023 count
Owner
County
County Highway Agency

About this bridge

Monad RD over Bbwa Canal 151 is a prestressed concrete tee beam carrying Monad RD over Bbwa Canal 151 in Yellowstone County, Montana. It was built in 1986, so it is 39 years old, younger 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 7,121 vehicles a day, projected to reach 8,367 by 2043. The structure is 50 ft (15.2 m) long and 75 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesMonad RD
CrossesBbwa Canal 151
LocationBillings-Monad RD
RouteCity Street 56010
StateMontana
Coordinates45.76246, -108.58636
Functional classUrban Collector

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 protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.1 US tons
Inventory rating30.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span48 ft (14.6 m)
Deck width75 ft (22.9 m)
Roadway width63 ft (19.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,121 (2023)
Projected traffic8,367 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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 Monad RD over Bbwa Canal 151 built?

It was built in 1986, making it 39 years old in 2025.

What condition is Monad RD over Bbwa Canal 151 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 Monad RD over Bbwa Canal 151 carry?

About 7,121 vehicles per day (2023 count).

How long is Monad RD over Bbwa Canal 151?

The structure is 50 ft (15.2 m) long with a longest span of 48 ft (14.6 m) and a deck 75 ft wide.

Who owns Monad RD over Bbwa Canal 151?

It is owned by the County Highway Agency.