US Bridges

I 90 over Int Haugan

Fair

Mineral County, Montana · Haugan · Structure no. I00090016+03302

Built
1976
49 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Concrete Continuous
Length
118 ft
3 main spans
Daily traffic
3,724
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 over Int Haugan is a concrete continuous tee beam carrying I 90 over Int Haugan in Mineral County, Montana. It was built in 1976, so it is 49 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 5 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 3,724 vehicles a day, roughly 26% of them trucks, projected to reach 3,910 by 2043. The structure is 118 ft (36 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesI 90
CrossesInt Haugan
LocationHaugan
RouteInterstate 90
CountyMineral County
StateMontana
Coordinates47.385, -115.39909
Functional classRural Principal Arterial - Interstate

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.1 US tons
Inventory rating37.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length118 ft (36 m)
Longest span81 ft (24.7 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,724 (2023)
Projected traffic3,910 by 2043
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 90 over Int Haugan built?

It was built in 1976, making it 49 years old in 2025.

What condition is I 90 over Int Haugan 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 June 2023.

How much traffic does I 90 over Int Haugan carry?

About 3,724 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is I 90 over Int Haugan?

The structure is 118 ft (36 m) long with a longest span of 81 ft (24.7 m) and a deck 44 ft wide.

Who owns I 90 over Int Haugan?

It is owned by the State Highway Agency.