US Bridges

Con 610 over Unstable Material

Fair

St. Louis County, Minnesota · 0.1 MI SW of JCT 5th Ave · Structure no. 69818A

Built
1985
40 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
222 ft
4 main spans
Daily traffic
4,008
2021 count
Owner
State
State Highway Agency

About this bridge

Con 610 over Unstable Material is a prestressed concrete stringer/multi-beam or girder carrying Con 610 over Unstable Material in St. Louis County, Minnesota. It was built in 1985, so it is 40 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 4,008 vehicles a day, roughly 3% of them trucks, projected to reach 2,000 by 2041. The structure is 222 ft (67.8 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesCon 610
CrossesUnstable Material
Location0.1 MI SW of JCT 5th Ave
RouteInterstate 610
Coordinates46.7807, -92.10297
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.1 US tons
Inventory rating45 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length222 ft (67.8 m)
Longest span55 ft (16.8 m)
Deck width26 ft (8 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,008 (2021)
Projected traffic2,000 by 2041
Trucks3%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed1.2 mi (2 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 Con 610 over Unstable Material built?

It was built in 1985, making it 40 years old in 2025.

What condition is Con 610 over Unstable Material 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 2024.

How much traffic does Con 610 over Unstable Material carry?

About 4,008 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Con 610 over Unstable Material?

The structure is 222 ft (67.8 m) long with a longest span of 55 ft (16.8 m) and a deck 26 ft wide.

Who owns Con 610 over Unstable Material?

It is owned by the State Highway Agency.