US Bridges

Csah 7 over Big Cottonwood River

Fair

Brown County, Minnesota · 0.5 MI N of JCT Csah 24 · Structure no. 08516

Built
1975
50 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
213 ft
3 main spans
Daily traffic
106
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 7 over Big Cottonwood River is a prestressed concrete stringer/multi-beam or girder carrying Csah 7 over Big Cottonwood River in Brown County, Minnesota. It was built in 1975, so it is 50 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 106 vehicles a day, projected to reach 110 by 2042. The structure is 213 ft (64.9 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCsah 7
CrossesBig Cottonwood River
Location0.5 MI N of JCT Csah 24
RouteCounty Highway 7
CountyBrown County
StateMinnesota
Coordinates44.23077, -94.84675
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating47.8 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length213 ft (64.9 m)
Longest span70 ft (21.3 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic106 (2022)
Projected traffic110 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Big Cottonwood River built?

It was built in 1975, making it 50 years old in 2025.

What condition is Csah 7 over Big Cottonwood 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 Big Cottonwood River carry?

About 106 vehicles per day (2022 count).

How long is Csah 7 over Big Cottonwood River?

The structure is 213 ft (64.9 m) long with a longest span of 70 ft (21.3 m) and a deck 36 ft wide.

Who owns Csah 7 over Big Cottonwood River?

It is owned by the County Highway Agency.