US Bridges

Central Ave Ramp over Underpass Avenue

Fair

Yellowstone County, Montana · Billings · Structure no. U01035000+05001

Built
1977
48 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
101 ft
2 main spans
Daily traffic
9,943
2023 count
Owner
County
County Highway Agency

About this bridge

Central Ave Ramp over Underpass Avenue is a prestressed concrete stringer/multi-beam or girder carrying Central Ave Ramp over Underpass Avenue 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 9,943 vehicles a day, projected to reach 10,439 by 2043. The structure is 101 ft (30.8 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesCentral Ave Ramp
CrossesUnderpass Avenue
LocationBillings
RouteCity Street 1008
CountyYellowstone County
StateMontana
Coordinates45.76858, -108.53044
Functional classUrban Minor 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length101 ft (30.8 m)
Longest span51 ft (15.4 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,943 (2023)
Projected traffic10,439 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed123.7 mi (199 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$218,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Central Ave Ramp over Underpass Avenue built?

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

What condition is Central Ave Ramp over Underpass Avenue 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 April 2023.

How much traffic does Central Ave Ramp over Underpass Avenue carry?

About 9,943 vehicles per day (2023 count).

How long is Central Ave Ramp over Underpass Avenue?

The structure is 101 ft (30.8 m) long with a longest span of 51 ft (15.4 m) and a deck 24 ft wide.

Who owns Central Ave Ramp over Underpass Avenue?

It is owned by the County Highway Agency.