US Bridges

IRR - US 89 over S Fork Cut Bank Creek

Good

Glacier County, Montana · 1M N Kiowa · Structure no. 000000000006058

Built
2018
7 years old
Condition
Good
inspected September 2024
Type
Tee Beam
Prestressed Concrete
Length
83 ft
1 main span
Daily traffic
1,148
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - US 89 over S Fork Cut Bank Creek is a prestressed concrete tee beam carrying IRR - US 89 over S Fork Cut Bank Creek in Glacier County, Montana. It was built in 2018, so it is 7 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,148 vehicles a day, roughly 1% of them trucks, projected to reach 1,349 by 2043. The structure is 83 ft (25.2 m) long and 43 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesIRR - US 89
CrossesS Fork Cut Bank Creek
Location1M N Kiowa
RouteU.S. Route 89
StateMontana
Coordinates48.5566, -113.2707
Functional classRural Minor Arterial

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.
Substructure9 ExcellentNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating63.1 US tons
Inventory rating46 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length83 ft (25.2 m)
Longest span80 ft (24.4 m)
Deck width43 ft (13.2 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,148 (2023)
Projected traffic1,349 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 - US 89 over S Fork Cut Bank Creek built?

It was built in 2018, making it 7 years old in 2025.

What condition is IRR - US 89 over S Fork Cut Bank Creek 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 September 2024.

How much traffic does IRR - US 89 over S Fork Cut Bank Creek carry?

About 1,148 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is IRR - US 89 over S Fork Cut Bank Creek?

The structure is 83 ft (25.2 m) long with a longest span of 80 ft (24.4 m) and a deck 43 ft wide.

Who owns IRR - US 89 over S Fork Cut Bank Creek?

It is owned by the State Highway Agency.