US Bridges

E Boulder Road over E Boulder River

Good

Sweet Grass County, Montana · 4M S Mcleod · Structure no. 000000202404531

Built
2024
1 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
70 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

E Boulder Road over E Boulder River is a steel stringer/multi-beam or girder carrying E Boulder Road over E Boulder River in Sweet Grass County, Montana. It was built in 2024, so it is 1 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 70 ft (21.3 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesE Boulder Road
CrossesE Boulder River
Location4M S Mcleod
RouteCounty Highway 49118
CountySweet Grass County
StateMontana
Coordinates45.584, -110.11086
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating39.7 US tons
Inventory rating30.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length70 ft (21.3 m)
Longest span66 ft (20.1 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was E Boulder Road over E Boulder River built?

It was built in 2024, making it 1 years old in 2025.

What condition is E Boulder Road over E Boulder 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 October 2024.

How much traffic does E Boulder Road over E Boulder River carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is E Boulder Road over E Boulder River?

The structure is 70 ft (21.3 m) long with a longest span of 66 ft (20.1 m) and a deck 24 ft wide.

Who owns E Boulder Road over E Boulder River?

It is owned by the County Highway Agency.