US Bridges

Csah 7 over Manitou River

Fair

Lake County, Minnesota · 2.1 MI SW of JCT Csah 8 · Structure no. 38506

Built
1976
49 years old
Condition
Fair
inspected October 2023
Type
Channel Beam
Prestressed Concrete
Length
93 ft
3 main spans
Daily traffic
110
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 7 over Manitou River is a prestressed concrete channel beam carrying Csah 7 over Manitou River in Lake County, Minnesota. It was built in 1976, so it is 49 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 5 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 110 vehicles a day, projected to reach 145 by 2042. The structure is 93 ft (28.4 m) long and 38 ft wide. If it were closed, the detour would be 42.9 mi (69 km).

Location

Open in Google Maps
CarriesCsah 7
CrossesManitou River
Location2.1 MI SW of JCT Csah 8
RouteCounty Highway 7
CountyLake County
StateMinnesota
Coordinates47.50486, -91.11706
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.8 US tons
Inventory rating45 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length93 ft (28.4 m)
Longest span31 ft (9.5 m)
Deck width38 ft (11.6 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2022)
Projected traffic145 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.9 mi (69 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 7 over Manitou River built?

It was built in 1976, making it 49 years old in 2025.

What condition is Csah 7 over Manitou River 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 2023.

How much traffic does Csah 7 over Manitou River carry?

About 110 vehicles per day (2022 count).

How long is Csah 7 over Manitou River?

The structure is 93 ft (28.4 m) long with a longest span of 31 ft (9.5 m) and a deck 38 ft wide.

Who owns Csah 7 over Manitou River?

It is owned by the County Highway Agency.