US Bridges

Galbreath RD over ST Mary Canal 045

Good

Glacier County, Montana · 18M NE Babb · Structure no. L18231007+02001

Built
1991
34 years old
Condition
Good
inspected November 2023
Type
Tee Beam
Prestressed Concrete
Length
82 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Galbreath RD over ST Mary Canal 045 is a prestressed concrete tee beam carrying Galbreath RD over ST Mary Canal 045 in Glacier County, Montana. It was built in 1991, so it is 34 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 82 ft (25 m) long and 26 ft wide. If it were closed, the detour would be 34.8 mi (56 km).

CarriesGalbreath RD
CrossesST Mary Canal 045
Location18M NE Babb
RouteCounty Highway 18231
StateMontana
Coordinates48.95074, -113.21102
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37 US tons
Inventory rating21.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length82 ft (25 m)
Longest span80 ft (24.4 m)
Deck width26 ft (8 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 directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.8 mi (56 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 Galbreath RD over ST Mary Canal 045 built?

It was built in 1991, making it 34 years old in 2025.

What condition is Galbreath RD over ST Mary Canal 045 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 November 2023.

How much traffic does Galbreath RD over ST Mary Canal 045 carry?

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

How long is Galbreath RD over ST Mary Canal 045?

The structure is 82 ft (25 m) long with a longest span of 80 ft (24.4 m) and a deck 26 ft wide.

Who owns Galbreath RD over ST Mary Canal 045?

It is owned by the County Highway Agency.