US Bridges

I 90 over Greycliff Creek RD

Fair

Sweet Grass County, Montana · 3.7M E Greycliff · Structure no. I00090381+05801

Built
1972
53 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete Continuous
Length
78 ft
3 main spans
Daily traffic
5,423
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 over Greycliff Creek RD is a concrete continuous slab carrying I 90 over Greycliff Creek RD in Sweet Grass County, Montana. It was built in 1972, so it is 53 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 5,423 vehicles a day, roughly 20% of them trucks, projected to reach 5,829 by 2043. The structure is 78 ft (23.8 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 90
CrossesGreycliff Creek RD
Location3.7M E Greycliff
RouteInterstate 90
CountySweet Grass County
StateMontana
Coordinates45.73206, -109.74622
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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating37 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length78 ft (23.8 m)
Longest span30 ft (9.1 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,423 (2023)
Projected traffic5,829 by 2043
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
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 Greycliff Creek RD built?

It was built in 1972, making it 53 years old in 2025.

What condition is I 90 over Greycliff Creek RD 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 I 90 over Greycliff Creek RD carry?

About 5,423 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is I 90 over Greycliff Creek RD?

The structure is 78 ft (23.8 m) long with a longest span of 30 ft (9.1 m) and a deck 44 ft wide.

Who owns I 90 over Greycliff Creek RD?

It is owned by the State Highway Agency.