US Bridges

Csah 9 over S Fk Watonwan River

FairPosted for load

Martin County, Minnesota · 0.3 MI S of JCT Csah 54 · Structure no. 4074

Built
1923
102 years old
Condition
Fair
inspected October 2024
Type
Girder and Floorbeam System
Concrete
Length
33 ft
1 main span
Daily traffic
85
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 9 over S Fk Watonwan River is a concrete girder and floorbeam system carrying Csah 9 over S Fk Watonwan River in Martin County, Minnesota. It was built in 1923, so it is 102 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. Its operating status is: posted for load restriction.

It carries about 85 vehicles a day, projected to reach 105 by 2042. The structure is 33 ft (10.1 m) long and 22 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCsah 9
CrossesS Fk Watonwan River
Location0.3 MI S of JCT Csah 54
RouteCounty Highway 9
CountyMartin County
StateMinnesota
Coordinates43.84319, -94.77453
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 protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be 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 alignment7: Better than present minimum criteria
Operating rating22.5 US tons
Inventory rating17.2 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span30 ft (9.1 m)
Deck width22 ft (6.8 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic85 (2022)
Projected traffic105 by 2042
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$198 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 9 over S Fk Watonwan River built?

It was built in 1923, making it 102 years old in 2025.

What condition is Csah 9 over S Fk 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 October 2024.

How much traffic does Csah 9 over S Fk Watonwan River carry?

About 85 vehicles per day (2022 count).

How long is Csah 9 over S Fk Watonwan River?

The structure is 33 ft (10.1 m) long with a longest span of 30 ft (9.1 m) and a deck 22 ft wide.

Who owns Csah 9 over S Fk Watonwan River?

It is owned by the County Highway Agency.