US Bridges

Mn 73 over I 35

Fair

Carlton County, Minnesota · At JCT TH 73; TH 35 · Structure no. 09811

Built
1965
60 years old, rebuilt 1990
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
232 ft
4 main spans
Daily traffic
5,053
2022 count
Owner
State
State Highway Agency

About this bridge

Mn 73 over I 35 is a prestressed concrete stringer/multi-beam or girder carrying Mn 73 over I 35 in Carlton County, Minnesota. It was built in 1965 and reconstructed in 1990, so it is 60 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 5,053 vehicles a day, roughly 10% of them trucks, projected to reach 5,100 by 2042. The structure is 232 ft (70.6 m) long and 50 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesMn 73
CrossesI 35
LocationAt JCT TH 73; TH 35
RouteState Highway 73
Coordinates46.43637, -92.74557
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
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 rating48.9 US tons
Inventory rating29.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length232 ft (70.6 m)
Longest span73 ft (22.2 m)
Deck width50 ft (15.3 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,053 (2022)
Projected traffic5,100 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

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 Mn 73 over I 35 built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1990.

What condition is Mn 73 over I 35 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 May 2024.

How much traffic does Mn 73 over I 35 carry?

About 5,053 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is Mn 73 over I 35?

The structure is 232 ft (70.6 m) long with a longest span of 73 ft (22.2 m) and a deck 50 ft wide.

Who owns Mn 73 over I 35?

It is owned by the State Highway Agency.