US Bridges

I 90 over TH 15

Fair

Martin County, Minnesota · At the JCT TH 15 · Structure no. 46833

Built
1973
52 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
194 ft
2 main spans
Daily traffic
4,500
2016 count
Owner
State
State Highway Agency

About this bridge

I 90 over TH 15 is a prestressed concrete stringer/multi-beam or girder carrying I 90 over TH 15 in Martin County, Minnesota. It was built in 1973, so it is 52 years old, older than the Minnesota average of 38.5 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 4,500 vehicles a day, roughly 19% of them trucks, projected to reach 4,500 by 2039. The structure is 194 ft (59 m) long and 57 ft wide.

Location

Open in Google Maps
CarriesI 90
CrossesTH 15
LocationAt the JCT TH 15
RouteInterstate 90
CountyMartin County
StateMinnesota
Coordinates43.67947, -94.44778
Functional classUrban 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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.9 US tons
Inventory rating27.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length194 ft (59 m)
Longest span97 ft (29.5 m)
Deck width57 ft (17.4 m)
Roadway width53 ft (16.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,500 (2016)
Projected traffic4,500 by 2039
Trucks19%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 TH 15 built?

It was built in 1973, making it 52 years old in 2025.

What condition is I 90 over TH 15 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 October 2023.

How much traffic does I 90 over TH 15 carry?

About 4,500 vehicles per day (2016 count), of which roughly 19% are trucks.

How long is I 90 over TH 15?

The structure is 194 ft (59 m) long with a longest span of 97 ft (29.5 m) and a deck 57 ft wide.

Who owns I 90 over TH 15?

It is owned by the State Highway Agency.