US Bridges

I 90 over Int Exit 396

Fair

Stillwater County, Montana · 5M E Reedpoint · Structure no. I00090396+09921

Built
1963
62 years old, rebuilt 1971
Condition
Fair
inspected December 2023
Type
Slab
Concrete
Length
22 ft
1 main span
Daily traffic
10,845
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 over Int Exit 396 is a concrete slab carrying I 90 over Int Exit 396 in Stillwater County, Montana. It was built in 1963 and reconstructed in 1971, so it is 62 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 10,845 vehicles a day, roughly 20% of them trucks, projected to reach 11,658 by 2043. The structure is 22 ft (6.7 m) long and 141 ft wide.

Location

Open in Google Maps
CarriesI 90
CrossesInt Exit 396
Location5M E Reedpoint
RouteInterstate 90
CountyStillwater County
StateMontana
Coordinates45.6838, -109.4533
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.5 US tons
Inventory rating33.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span20 ft (6.1 m)
Deck width141 ft (43 m)
Roadway width141 ft (43 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,845 (2023)
Projected traffic11,658 by 2043
Trucks20%
Lanes on structure2
Traffic directionTwo-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 Exit 396 built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1971.

What condition is I 90 over Int Exit 396 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 December 2023.

How much traffic does I 90 over Int Exit 396 carry?

About 10,845 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is I 90 over Int Exit 396?

The structure is 22 ft (6.7 m) long with a longest span of 20 ft (6.1 m) and a deck 141 ft wide.

Who owns I 90 over Int Exit 396?

It is owned by the State Highway Agency.