US Bridges

IRR - S 49 over Two Medicine River 001

Fair

Glacier County, Montana · 3M N East Glacier · Structure no. L18203002+06001

Built
1966
59 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
144 ft
3 main spans
Daily traffic
2,059
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - S 49 over Two Medicine River 001 is a prestressed concrete stringer/multi-beam or girder carrying IRR - S 49 over Two Medicine River 001 in Glacier County, Montana. It was built in 1966, so it is 59 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 2,059 vehicles a day, projected to reach 2,419 by 2043. The structure is 144 ft (43.9 m) long and 33 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesIRR - S 49
CrossesTwo Medicine River 001
Location3M N East Glacier
RouteState Highway 49
CountyGlacier County
StateMontana
Coordinates48.47036, -113.23686
Functional classRural Major Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 rating36 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length144 ft (43.9 m)
Longest span70 ft (21.3 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,059 (2023)
Projected traffic2,419 by 2043
Trucks0%
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

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 IRR - S 49 over Two Medicine River 001 built?

It was built in 1966, making it 59 years old in 2025.

What condition is IRR - S 49 over Two Medicine River 001 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 March 2023.

How much traffic does IRR - S 49 over Two Medicine River 001 carry?

About 2,059 vehicles per day (2023 count).

How long is IRR - S 49 over Two Medicine River 001?

The structure is 144 ft (43.9 m) long with a longest span of 70 ft (21.3 m) and a deck 33 ft wide.

Who owns IRR - S 49 over Two Medicine River 001?

It is owned by the State Highway Agency.