US Bridges

Continental DR over Sep I 15

Fair

Silver Bow County, Montana · Butte-Continental DR · Structure no. U01807003+09761

Built
1963
62 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
266 ft
1 main span
Daily traffic
5,500
2023 count
Owner
State
State Highway Agency

About this bridge

Continental DR over Sep I 15 is a steel stringer/multi-beam or girder carrying Continental DR over Sep I 15 in Silver Bow County, Montana. It was built in 1963, so it is 62 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 5,500 vehicles a day, roughly 1% of them trucks, projected to reach 6,298 by 2043. The structure is 266 ft (81 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesContinental DR
CrossesSep I 15
LocationButte-Continental DR
RouteCity Street 1807
CountySilver Bow County
StateMontana
Coordinates45.98124, -112.48717
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+3 approach)
Design loadHS 20
Structure length266 ft (81 m)
Longest span78 ft (23.8 m)
Deck width36 ft (11.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,500 (2023)
Projected traffic6,298 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$864,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Continental DR over Sep I 15 built?

It was built in 1963, making it 62 years old in 2025.

What condition is Continental DR over Sep I 15 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 August 2023.

How much traffic does Continental DR over Sep I 15 carry?

About 5,500 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Continental DR over Sep I 15?

The structure is 266 ft (81 m) long with a longest span of 78 ft (23.8 m) and a deck 36 ft wide.

Who owns Continental DR over Sep I 15?

It is owned by the State Highway Agency.