US Bridges

US 287 over Missouri River

Good

Broadwater County, Montana · Toston · Structure no. 000000202005332

Built
2020
5 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
661 ft
4 main spans
Daily traffic
5,250
2023 count
Owner
State
State Highway Agency

About this bridge

US 287 over Missouri River is a steel stringer/multi-beam or girder carrying US 287 over Missouri River in Broadwater County, Montana. It was built in 2020, so it is 5 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 5,250 vehicles a day, roughly 6% of them trucks, projected to reach 5,906 by 2043. The structure is 661 ft (201.5 m) long and 66 ft wide. If it were closed, the detour would be 80.2 mi (129 km).

Location

Open in Google Maps
CarriesUS 287
CrossesMissouri River
LocationToston
RouteU.S. Route 287
CountyBroadwater County
StateMontana
Coordinates46.174, -111.44572
Functional classRural Principal Arterial - Other

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length661 ft (201.5 m)
Longest span185 ft (56.4 m)
Deck width66 ft (20.1 m)
Roadway width63 ft (19.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,250 (2023)
Projected traffic5,906 by 2043
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed80.2 mi (129 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 287 over Missouri River built?

It was built in 2020, making it 5 years old in 2025.

What condition is US 287 over Missouri River 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 August 2024.

How much traffic does US 287 over Missouri River carry?

About 5,250 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US 287 over Missouri River?

The structure is 661 ft (201.5 m) long with a longest span of 185 ft (56.4 m) and a deck 66 ft wide.

Who owns US 287 over Missouri River?

It is owned by the State Highway Agency.