US Bridges

Mn 61 over Manitou River

Poor

Lake County, Minnesota · 8.8 MI N of JCT TH 1 · Structure no. 9002

Built
1956
69 years old
Condition
Poor
inspected September 2024
Type
Culvert
Concrete
Length
33 ft
1 main span
Daily traffic
3,000
2018 count
Owner
State
State Highway Agency

About this bridge

Mn 61 over Manitou River is a concrete culvert carrying Mn 61 over Manitou River in Lake County, Minnesota. It was built in 1956, so it is 69 years old, older than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 3,000 vehicles a day, roughly 8% of them trucks, projected to reach 3,000 by 2038. The structure is 33 ft (10.1 m) long. If it were closed, the detour would be 24.9 mi (40 km).

CarriesMn 61
CrossesManitou River
Location8.8 MI N of JCT TH 1
RouteState Highway 61
Coordinates47.44435, -91.06866
Functional classRural Principal Arterial - Other

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadH 15
Structure length33 ft (10.1 m)
Longest span30 ft (9.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2018)
Projected traffic3,000 by 2038
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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$172 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Mn 61 over Manitou River built?

It was built in 1956, making it 69 years old in 2025.

What condition is Mn 61 over Manitou River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does Mn 61 over Manitou River carry?

About 3,000 vehicles per day (2018 count), of which roughly 8% are trucks.

How long is Mn 61 over Manitou River?

The structure is 33 ft (10.1 m) long with a longest span of 30 ft (9.2 m).

Who owns Mn 61 over Manitou River?

It is owned by the State Highway Agency.