US Bridges

Csah 18 over Trib Rock River

Fair

Pipestone County, Minnesota · 0.4 MI S of JCT Csah 3 · Structure no. 91498

Built
1977
48 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete
Length
30 ft
2 main spans
Daily traffic
700
2016 count
Owner
County
County Highway Agency

About this bridge

Csah 18 over Trib Rock River is a concrete culvert carrying Csah 18 over Trib Rock River in Pipestone County, Minnesota. It was built in 1977, so it is 48 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 700 vehicles a day, projected to reach 700 by 2039. The structure is 30 ft (9.1 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCsah 18
CrossesTrib Rock River
Location0.4 MI S of JCT Csah 3
RouteCounty Highway 18
CountyPipestone County
StateMinnesota
Coordinates43.94389, -96.10413
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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span11 ft (3.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic700 (2016)
Projected traffic700 by 2039
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 18 over Trib Rock River built?

It was built in 1977, making it 48 years old in 2025.

What condition is Csah 18 over Trib Rock 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 July 2024.

How much traffic does Csah 18 over Trib Rock River carry?

About 700 vehicles per day (2016 count).

How long is Csah 18 over Trib Rock River?

The structure is 30 ft (9.1 m) long with a longest span of 11 ft (3.5 m).

Who owns Csah 18 over Trib Rock River?

It is owned by the County Highway Agency.