US Bridges

Csah 18 over Spring Brook

Fair

Houston County, Minnesota · 0.4 MI N of JCT Csah 3 · Structure no. 91590

Built
1979
46 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
30 ft
2 main spans
Daily traffic
347
2021 count
Owner
County
County Highway Agency

About this bridge

Csah 18 over Spring Brook is a concrete culvert carrying Csah 18 over Spring Brook in Houston County, Minnesota. It was built in 1979, so it is 46 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 347 vehicles a day, projected to reach 350 by 2041. The structure is 30 ft (9 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCsah 18
CrossesSpring Brook
Location0.4 MI N of JCT Csah 3
RouteCounty Highway 18
CountyHouston County
StateMinnesota
Coordinates43.70057, -91.27979
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 48 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 rating59.4 US tons
Inventory rating39.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length30 ft (9 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic347 (2021)
Projected traffic350 by 2041
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Spring Brook built?

It was built in 1979, making it 46 years old in 2025.

What condition is Csah 18 over Spring Brook 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 18 over Spring Brook carry?

About 347 vehicles per day (2021 count).

How long is Csah 18 over Spring Brook?

The structure is 30 ft (9 m) long with a longest span of 14 ft (4.3 m).

Who owns Csah 18 over Spring Brook?

It is owned by the County Highway Agency.