US Bridges

Csah 29 over Watonwan River

Fair

Cottonwood County, Minnesota · 0.9 MI S of JCT Csah 3 · Structure no. 89571

Built
1939
86 years old
Condition
Fair
inspected September 2024
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
156
2021 count
Owner
County
County Highway Agency

About this bridge

Csah 29 over Watonwan River is a concrete culvert carrying Csah 29 over Watonwan River in Cottonwood County, Minnesota. It was built in 1939, so it is 86 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 156 vehicles a day, projected to reach 200 by 2041. The structure is 22 ft (6.8 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCsah 29
CrossesWatonwan River
Location0.9 MI S of JCT Csah 3
RouteCounty Highway 29
CountyCottonwood County
StateMinnesota
Coordinates43.97931, -94.95964
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length22 ft (6.8 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic156 (2021)
Projected traffic200 by 2041
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$46 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 29 over Watonwan River built?

It was built in 1939, making it 86 years old in 2025.

What condition is Csah 29 over Watonwan 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 September 2024.

How much traffic does Csah 29 over Watonwan River carry?

About 156 vehicles per day (2021 count).

How long is Csah 29 over Watonwan River?

The structure is 22 ft (6.8 m) long with a longest span of 10 ft (3 m).

Who owns Csah 29 over Watonwan River?

It is owned by the County Highway Agency.