US Bridges

Mn 61 over Conveyor Tunnel

Fair

Lake County, Minnesota · 2.6 MI NE of JCT Csah 4 · Structure no. 93346

Built
1978
47 years old
Condition
Fair
inspected May 2023
Type
Culvert
Steel
Length
28 ft
1 main span
Daily traffic
4,217
2022 count
Owner
Private
Private (other than railroad)

About this bridge

Mn 61 over Conveyor Tunnel is a steel culvert carrying Mn 61 over Conveyor Tunnel in Lake County, Minnesota. It was built in 1978, so it is 47 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 4,217 vehicles a day, roughly 11% of them trucks, projected to reach 4,700 by 2042. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMn 61
CrossesConveyor Tunnel
Location2.6 MI NE of JCT Csah 4
RouteState Highway 61
CountyLake County
StateMinnesota
Coordinates47.287, -91.26531
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.6 US tons
Inventory rating28.8 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span28 ft (8.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,217 (2022)
Projected traffic4,700 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerPrivate (other than railroad)
Maintained byPrivate (other than railroad)
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 61 over Conveyor Tunnel built?

It was built in 1978, making it 47 years old in 2025.

What condition is Mn 61 over Conveyor Tunnel 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 2023.

How much traffic does Mn 61 over Conveyor Tunnel carry?

About 4,217 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is Mn 61 over Conveyor Tunnel?

The structure is 28 ft (8.5 m) long with a longest span of 28 ft (8.5 m).

Who owns Mn 61 over Conveyor Tunnel?

It is owned by the Private (other than railroad).