US Bridges

US 93 over Int Desmet I 90

Fair

Missoula County, Montana · 5M NW Missoula · Structure no. P00005000+00002

Built
1995
30 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
348 ft
4 main spans
Daily traffic
5,175
2023 count
Owner
State
State Highway Agency

About this bridge

US 93 over Int Desmet I 90 is a prestressed concrete stringer/multi-beam or girder carrying US 93 over Int Desmet I 90 in Missoula County, Montana. It was built in 1995, so it is 30 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 5,175 vehicles a day, roughly 4% of them trucks, projected to reach 5,433 by 2043. The structure is 348 ft (106 m) long and 39 ft wide.

CarriesUS 93
CrossesInt Desmet I 90
Location5M NW Missoula
RouteU.S. Route 93
StateMontana
Coordinates46.95145, -114.13137
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
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 rating61 US tons
Inventory rating41 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length348 ft (106 m)
Longest span87 ft (26.5 m)
Deck width39 ft (11.9 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,175 (2023)
Projected traffic5,433 by 2043
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 US 93 over Int Desmet I 90 built?

It was built in 1995, making it 30 years old in 2025.

What condition is US 93 over Int Desmet I 90 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 June 2024.

How much traffic does US 93 over Int Desmet I 90 carry?

About 5,175 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 93 over Int Desmet I 90?

The structure is 348 ft (106 m) long with a longest span of 87 ft (26.5 m) and a deck 39 ft wide.

Who owns US 93 over Int Desmet I 90?

It is owned by the State Highway Agency.