US Bridges

Burlington ST over Sep I 90 006

Fair

Silver Bow County, Montana · Butte-Burlington ST · Structure no. L47426000+01001

Built
1964
61 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
254 ft
4 main spans
Daily traffic
583
2023 count
Owner
State
State Highway Agency

About this bridge

Burlington ST over Sep I 90 006 is a prestressed concrete stringer/multi-beam or girder carrying Burlington ST over Sep I 90 006 in Silver Bow County, Montana. It was built in 1964, so it is 61 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 5 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 583 vehicles a day, projected to reach 612 by 2043. The structure is 254 ft (77.5 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesBurlington ST
CrossesSep I 90 006
LocationButte-Burlington ST
RouteCounty Highway 47608
CountySilver Bow County
StateMontana
Coordinates45.97491, -112.47635
Functional classUrban Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length254 ft (77.5 m)
Longest span71 ft (21.6 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic583 (2023)
Projected traffic612 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Burlington ST over Sep I 90 006 built?

It was built in 1964, making it 61 years old in 2025.

What condition is Burlington ST over Sep I 90 006 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 September 2023.

How much traffic does Burlington ST over Sep I 90 006 carry?

About 583 vehicles per day (2023 count).

How long is Burlington ST over Sep I 90 006?

The structure is 254 ft (77.5 m) long with a longest span of 71 ft (21.6 m) and a deck 27 ft wide.

Who owns Burlington ST over Sep I 90 006?

It is owned by the State Highway Agency.