US Bridges

I 90 over Sep Youngs Point Road

Good

Stillwater County, Montana · 4.3M W Park City · Structure no. I00090421+08101

Built
1970
55 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
136 ft
3 main spans
Daily traffic
6,161
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 over Sep Youngs Point Road is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Sep Youngs Point Road in Stillwater County, Montana. It was built in 1970, so it is 55 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 6,161 vehicles a day, roughly 20% of them trucks, projected to reach 6,715 by 2043. The structure is 136 ft (41.5 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 90
CrossesSep Youngs Point Road
Location4.3M W Park City
RouteInterstate 90
CountyStillwater County
StateMontana
Coordinates45.61243, -109.00767
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.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length136 ft (41.5 m)
Longest span72 ft (21.9 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,161 (2023)
Projected traffic6,715 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 Sep Youngs Point Road built?

It was built in 1970, making it 55 years old in 2025.

What condition is I 90 over Sep Youngs Point Road 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 March 2023.

How much traffic does I 90 over Sep Youngs Point Road carry?

About 6,161 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is I 90 over Sep Youngs Point Road?

The structure is 136 ft (41.5 m) long with a longest span of 72 ft (21.9 m) and a deck 44 ft wide.

Who owns I 90 over Sep Youngs Point Road?

It is owned by the State Highway Agency.