US Bridges

Emigrant Gap RD over ST Mary Canal 046

Good

Glacier County, Montana · 35M N Browning · Structure no. L18205032+08001

Built
1991
34 years old
Condition
Good
inspected November 2023
Type
Tee Beam
Prestressed Concrete
Length
82 ft
1 main span
Daily traffic
966
2023 count
Owner
County
County Highway Agency

About this bridge

Emigrant Gap RD over ST Mary Canal 046 is a prestressed concrete tee beam carrying Emigrant Gap RD over ST Mary Canal 046 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 966 vehicles a day, roughly 3% of them trucks, projected to reach 1,019 by 2043. The structure is 82 ft (25 m) long and 26 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesEmigrant Gap RD
CrossesST Mary Canal 046
Location35M N Browning
RouteCounty Highway 18205
StateMontana
Coordinates48.99066, -113.09482
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating37 US tons
Inventory rating24 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 traffic966 (2023)
Projected traffic1,019 by 2043
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 Emigrant Gap RD over ST Mary Canal 046 built?

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

What condition is Emigrant Gap RD over ST Mary Canal 046 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 Emigrant Gap RD over ST Mary Canal 046 carry?

About 966 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Emigrant Gap RD over ST Mary Canal 046?

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 Emigrant Gap RD over ST Mary Canal 046?

It is owned by the County Highway Agency.