US Bridges

Csah 8 over Cottonwood River

Fair

Brown County, Minnesota · 0.4 MI N of JCT Csah 24 · Structure no. 7203

Built
1963
62 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
175 ft
3 main spans
Daily traffic
574
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 8 over Cottonwood River is a steel continuous stringer/multi-beam or girder carrying Csah 8 over Cottonwood River in Brown County, Minnesota. It was built in 1963, so it is 62 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 574 vehicles a day, projected to reach 600 by 2042. The structure is 175 ft (53.3 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCsah 8
CrossesCottonwood River
Location0.4 MI N of JCT Csah 24
RouteCounty Highway 8
CountyBrown County
StateMinnesota
Coordinates44.22765, -94.80634
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.2 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length175 ft (53.3 m)
Longest span80 ft (24.4 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic574 (2022)
Projected traffic600 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 8 over Cottonwood River built?

It was built in 1963, making it 62 years old in 2025.

What condition is Csah 8 over 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 8 over Cottonwood River carry?

About 574 vehicles per day (2022 count).

How long is Csah 8 over Cottonwood River?

The structure is 175 ft (53.3 m) long with a longest span of 80 ft (24.4 m) and a deck 31 ft wide.

Who owns Csah 8 over Cottonwood River?

It is owned by the County Highway Agency.