US Bridges

Mullowney LN over Laurel Road

Fair

Yellowstone County, Montana · Billings-Mullowney LN · Structure no. U01010002+09211

Built
2007
18 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
172 ft
2 main spans
Daily traffic
13,348
2023 count
Owner
State
State Highway Agency

About this bridge

Mullowney LN over Laurel Road is a prestressed concrete stringer/multi-beam or girder carrying Mullowney LN over Laurel Road in Yellowstone County, Montana. It was built in 2007, so it is 18 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 13,348 vehicles a day, projected to reach 15,283 by 2043. The structure is 172 ft (52.3 m) long and 103 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMullowney LN
CrossesLaurel Road
LocationBillings-Mullowney LN
RouteCity Street 111
CountyYellowstone County
StateMontana
Coordinates45.75135, -108.55888
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating68 US tons
Inventory rating52 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length172 ft (52.3 m)
Longest span85 ft (26 m)
Deck width103 ft (31.3 m)
Roadway width97 ft (29.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,348 (2023)
Projected traffic15,283 by 2043
Trucks0%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$807,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mullowney LN over Laurel Road built?

It was built in 2007, making it 18 years old in 2025.

What condition is Mullowney LN over Laurel Road 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 2023.

How much traffic does Mullowney LN over Laurel Road carry?

About 13,348 vehicles per day (2023 count).

How long is Mullowney LN over Laurel Road?

The structure is 172 ft (52.3 m) long with a longest span of 85 ft (26 m) and a deck 103 ft wide.

Who owns Mullowney LN over Laurel Road?

It is owned by the State Highway Agency.