US Bridges

Two Medicine Road over Two Medicine River

Fair

Glacier County, Montana · 5.3 Miles Northwest of Mo · Structure no. 1430002P0000000

Built
1950
75 years old, rebuilt 1964
Condition
Fair
inspected September 2023
Type
Frame
Concrete Continuous
Length
105 ft
3 main spans
Daily traffic
183
2017 count
Owner
Federal
National Park Service

About this bridge

Two Medicine Road over Two Medicine River is a concrete continuous frame carrying Two Medicine Road over Two Medicine River in Glacier County, Montana. It was built in 1950 and reconstructed in 1964, so it is 75 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 183 vehicles a day, roughly 1% of them trucks, projected to reach 220 by 2037. The structure is 105 ft (32 m) long and 33 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesTwo Medicine Road
CrossesTwo Medicine River
Location5.3 Miles Northwest of Mo
RouteFederal Lands Road 18204
CountyGlacier County
StateMontana
Coordinates48.49544, -113.34778
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating58 US tons
Inventory rating34.9 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length105 ft (32 m)
Longest span47 ft (14.2 m)
Deck width33 ft (10.2 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic183 (2017)
Projected traffic220 by 2037
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$132,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Two Medicine Road over Two Medicine River built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1964.

What condition is Two Medicine Road over Two Medicine River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2023.

How much traffic does Two Medicine Road over Two Medicine River carry?

About 183 vehicles per day (2017 count), of which roughly 1% are trucks.

How long is Two Medicine Road over Two Medicine River?

The structure is 105 ft (32 m) long with a longest span of 47 ft (14.2 m) and a deck 33 ft wide.

Who owns Two Medicine Road over Two Medicine River?

It is owned by the National Park Service.