US Bridges

I 90 over TH 4

Fair

Martin County, Minnesota · At the JCT TH 4 · Structure no. 46805

Built
1972
53 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
187 ft
3 main spans
Daily traffic
4,300
2016 count
Owner
State
State Highway Agency

About this bridge

I 90 over TH 4 is a prestressed concrete stringer/multi-beam or girder carrying I 90 over TH 4 in Martin County, Minnesota. It was built in 1972, so it is 53 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 4,300 vehicles a day, roughly 23% of them trucks, projected to reach 4,300 by 2039. The structure is 187 ft (57.1 m) long and 50 ft wide.

Location

Open in Google Maps
CarriesI 90
CrossesTH 4
LocationAt the JCT TH 4
RouteInterstate 90
CountyMartin County
StateMinnesota
Coordinates43.66497, -94.73384
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 inspectionJune 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 rating67.1 US tons
Inventory rating27.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length187 ft (57.1 m)
Longest span89 ft (27.2 m)
Deck width50 ft (15.1 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,300 (2016)
Projected traffic4,300 by 2039
Trucks23%
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 4 built?

It was built in 1972, making it 53 years old in 2025.

What condition is I 90 over TH 4 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 2023.

How much traffic does I 90 over TH 4 carry?

About 4,300 vehicles per day (2016 count), of which roughly 23% are trucks.

How long is I 90 over TH 4?

The structure is 187 ft (57.1 m) long with a longest span of 89 ft (27.2 m) and a deck 50 ft wide.

Who owns I 90 over TH 4?

It is owned by the State Highway Agency.