US Bridges

E Boulder RD over Boulder River 030

Good

Sweet Grass County, Montana · 2M S Mcleod · Structure no. L49116000+03001

Built
2002
23 years old
Condition
Good
inspected July 2024
Type
Tee Beam
Prestressed Concrete
Length
118 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

E Boulder RD over Boulder River 030 is a prestressed concrete tee beam carrying E Boulder RD over Boulder River 030 in Sweet Grass County, Montana. It was built in 2002, so it is 23 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 118 ft (36.1 m) long and 31 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesE Boulder RD
CrossesBoulder River 030
Location2M S Mcleod
RouteCounty Highway 49116
StateMontana
Coordinates45.62261, -110.12921
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length118 ft (36.1 m)
Longest span118 ft (36.1 m)
Deck width31 ft (9.6 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-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 RD over Boulder River 030 built?

It was built in 2002, making it 23 years old in 2025.

What condition is E Boulder RD over Boulder River 030 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 July 2024.

How much traffic does E Boulder RD over Boulder River 030 carry?

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

How long is E Boulder RD over Boulder River 030?

The structure is 118 ft (36.1 m) long with a longest span of 118 ft (36.1 m) and a deck 31 ft wide.

Who owns E Boulder RD over Boulder River 030?

It is owned by the County Highway Agency.