US Bridges

I 90 over Sep County RD Peerson RD

Fair

Park County, Montana · 8.7M W Springdale · Structure no. I00090345+07862

Built
1987
38 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
62 ft
3 main spans
Daily traffic
5,766
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 over Sep County RD Peerson RD is a concrete continuous slab carrying I 90 over Sep County RD Peerson RD in Park County, Montana. It was built in 1987, so it is 38 years old, younger 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 5,766 vehicles a day, roughly 19% of them trucks, projected to reach 6,284 by 2043. The structure is 62 ft (18.9 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 90
CrossesSep County RD Peerson RD
Location8.7M W Springdale
RouteInterstate 90
CountyPark County
StateMontana
Coordinates45.70511, -110.34851
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 inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45 US tons
Inventory rating35.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span23 ft (7 m)
Deck width40 ft (12.3 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,766 (2023)
Projected traffic6,284 by 2043
Trucks19%
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 Sep County RD Peerson RD built?

It was built in 1987, making it 38 years old in 2025.

What condition is I 90 over Sep County RD Peerson 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 January 2025.

How much traffic does I 90 over Sep County RD Peerson RD carry?

About 5,766 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is I 90 over Sep County RD Peerson RD?

The structure is 62 ft (18.9 m) long with a longest span of 23 ft (7 m) and a deck 40 ft wide.

Who owns I 90 over Sep County RD Peerson RD?

It is owned by the State Highway Agency.