Csah 11 over Big Cottonwood River

FairPosted for load

Lyon County, Minnesota · 0.6 MI S of JCT Csah 2 · Structure no. 42507

Built: 1964; 61 years old
Condition: Fair; inspected October 2023
Type: Slab; Wood or Timber
Length: 26 ft; 1 main span
Daily traffic: 960; 2018 count
Owner: County; County Highway Agency

About this bridge

Csah 11 over Big Cottonwood River is a wood or timber slab carrying Csah 11 over Big Cottonwood River in Lyon County, Minnesota. It was built in 1964, so it is 61 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. Its operating status is: posted for load restriction.

It carries about 960 vehicles a day, projected to reach 770 by 2038. The structure is 26 ft (8 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps

CarriesCsah 11

CrossesBig Cottonwood River

Location0.6 MI S of JCT Csah 2

RouteCounty Highway 11

CountyLyon County

StateMinnesota

Coordinates44.30446, -95.61371

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.

Component	Rating	Meaning
Deck	7 Good	Some minor problems.
Superstructure	7 Good	Some minor problems.
Substructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionOctober 2023

Inspection intervalevery 24 months

Operating statusPosted for load restriction

ScourScour critical; foundations unstable for calculated scour conditions

Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is

Deck geometry6: Equal to present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating44.3 US tons

Inventory rating28.8 US tons

Structure

Structure typeSlab

MaterialWood or Timber

DeckWood or timber

Main spans1

Design loadUnknown

Structure length26 ft (8 m)

Longest span24 ft (7.3 m)

Deck width31 ft (9.5 m)

Roadway width30 ft (9.1 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic960 (2018)

Projected traffic770 by 2038

Trucks—

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed3.1 mi (5 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 11 over Big Cottonwood River built?

It was built in 1964, making it 61 years old in 2025.

What condition is Csah 11 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 11 over Big Cottonwood River carry?

About 960 vehicles per day (2018 count).

How long is Csah 11 over Big Cottonwood River?

The structure is 26 ft (8 m) long with a longest span of 24 ft (7.3 m) and a deck 31 ft wide.

Who owns Csah 11 over Big Cottonwood River?

It is owned by the County Highway Agency.