US Bridges

US 89 over Two Medicine River

Fair

Glacier County, Montana · 11M SE Browning · Structure no. P00003101+08001

Built
1950
75 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
268 ft
3 main spans
Daily traffic
1,266
2023 count
Owner
State
State Highway Agency

About this bridge

US 89 over Two Medicine River is a steel continuous stringer/multi-beam or girder carrying US 89 over Two Medicine River in Glacier County, Montana. It was built in 1950, 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 1,266 vehicles a day, roughly 4% of them trucks, projected to reach 1,329 by 2043. The structure is 268 ft (81.7 m) long and 33 ft wide. If it were closed, the detour would be 72.7 mi (117 km).

Location

Open in Google Maps
CarriesUS 89
CrossesTwo Medicine River
Location11M SE Browning
RouteU.S. Route 89
CountyGlacier County
StateMontana
Coordinates48.47295, -112.8016
Functional classRural Minor Arterial

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 protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 alignment7: Better than present minimum criteria
Operating rating34 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length268 ft (81.7 m)
Longest span105 ft (32 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,266 (2023)
Projected traffic1,329 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed72.7 mi (117 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US 89 over Two Medicine River built?

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

What condition is US 89 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 October 2023.

How much traffic does US 89 over Two Medicine River carry?

About 1,266 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 89 over Two Medicine River?

The structure is 268 ft (81.7 m) long with a longest span of 105 ft (32 m) and a deck 33 ft wide.

Who owns US 89 over Two Medicine River?

It is owned by the State Highway Agency.