US Bridges

Csah 18 over Thompson Creek

Fair

Houston County, Minnesota · 0.1 MI SE of JCT TH 44 · Structure no. 28506

Built
1976
49 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
133 ft
3 main spans
Daily traffic
616
2021 count
Owner
County
County Highway Agency

About this bridge

Csah 18 over Thompson Creek is a steel continuous stringer/multi-beam or girder carrying Csah 18 over Thompson Creek in Houston County, Minnesota. It was built in 1976, so it is 49 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 616 vehicles a day, projected to reach 760 by 2041. The structure is 133 ft (40.4 m) long and 48 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesCsah 18
CrossesThompson Creek
Location0.1 MI SE of JCT TH 44
RouteCounty Highway 18
CountyHouston County
StateMinnesota
Coordinates43.75817, -91.34512
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length133 ft (40.4 m)
Longest span50 ft (15.2 m)
Deck width48 ft (14.6 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic616 (2021)
Projected traffic760 by 2041
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Thompson Creek built?

It was built in 1976, making it 49 years old in 2025.

What condition is Csah 18 over Thompson Creek 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 Thompson Creek carry?

About 616 vehicles per day (2021 count).

How long is Csah 18 over Thompson Creek?

The structure is 133 ft (40.4 m) long with a longest span of 50 ft (15.2 m) and a deck 48 ft wide.

Who owns Csah 18 over Thompson Creek?

It is owned by the County Highway Agency.