US Bridges

I 90 over Work Creek

Fair

Sweet Grass County, Montana · 3.7M W Reed Point · Structure no. I00090388+03001

Built
1972
53 years old
Condition
Fair
inspected September 2023
Type
Culvert
Steel
Length
21 ft
1 main span
Daily traffic
10,845
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 over Work Creek is a steel culvert carrying I 90 over Work Creek 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 10,845 vehicles a day, roughly 20% of them trucks, projected to reach 11,658 by 2043. The structure is 21 ft (6.5 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 90
CrossesWork Creek
Location3.7M W Reed Point
RouteInterstate 90
CountySweet Grass County
StateMontana
Coordinates45.70863, -109.61841
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20
Structure length21 ft (6.5 m)
Longest span21 ft (6.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,845 (2023)
Projected traffic11,658 by 2043
Trucks20%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$528,000
NavigationNo navigation control on waterway

Frequently asked questions

When was I 90 over Work Creek built?

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

What condition is I 90 over Work Creek 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 September 2023.

How much traffic does I 90 over Work Creek carry?

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

How long is I 90 over Work Creek?

The structure is 21 ft (6.5 m) long with a longest span of 21 ft (6.5 m).

Who owns I 90 over Work Creek?

It is owned by the State Highway Agency.