US Bridges

I 90 over Cedar Creek

Good

Mineral County, Montana · 1.2M E Superior · Structure no. I00090049+00662

Built
1960
65 years old, rebuilt 2012
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
169 ft
3 main spans
Daily traffic
3,825
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 over Cedar Creek is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Cedar Creek in Mineral County, Montana. It was built in 1960 and reconstructed in 2012, so it is 65 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,825 vehicles a day, roughly 24% of them trucks, projected to reach 4,015 by 2043. The structure is 169 ft (51.5 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 90
CrossesCedar Creek
Location1.2M E Superior
RouteInterstate 90
CountyMineral County
StateMontana
Coordinates47.17744, -114.86759
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.9 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length169 ft (51.5 m)
Longest span56 ft (17.1 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,825 (2023)
Projected traffic4,015 by 2043
Trucks24%
Lanes on structure2
Traffic directionOne-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$479,000
NavigationNo navigation control on waterway

Frequently asked questions

When was I 90 over Cedar Creek built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2012.

What condition is I 90 over Cedar 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 October 2023.

How much traffic does I 90 over Cedar Creek carry?

About 3,825 vehicles per day (2023 count), of which roughly 24% are trucks.

How long is I 90 over Cedar Creek?

The structure is 169 ft (51.5 m) long with a longest span of 56 ft (17.1 m) and a deck 31 ft wide.

Who owns I 90 over Cedar Creek?

It is owned by the State Highway Agency.