US Bridges

Csah 80 over Simian Creek

FairPosted for load

St. Louis County, Minnesota · 0.7 MI E of JCT CR867 · Structure no. 7745

Built
1938
87 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
27 ft
2 main spans
Daily traffic
415
2019 count
Owner
County
County Highway Agency

About this bridge

Csah 80 over Simian Creek is a concrete culvert carrying Csah 80 over Simian Creek in St. Louis County, Minnesota. It was built in 1938, so it is 87 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. Its operating status is: posted for load restriction.

It carries about 415 vehicles a day, projected to reach 390 by 2039. The structure is 27 ft (8.1 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCsah 80
CrossesSimian Creek
Location0.7 MI E of JCT CR867
RouteCounty Highway 80
CountySt. Louis County
StateMinnesota
Coordinates46.79476, -92.52024
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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 rating37.8 US tons
Inventory rating22.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length27 ft (8.1 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic415 (2019)
Projected traffic390 by 2039
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$500 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 80 over Simian Creek built?

It was built in 1938, making it 87 years old in 2025.

What condition is Csah 80 over Simian 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 80 over Simian Creek carry?

About 415 vehicles per day (2019 count).

How long is Csah 80 over Simian Creek?

The structure is 27 ft (8.1 m) long with a longest span of 12 ft (3.7 m).

Who owns Csah 80 over Simian Creek?

It is owned by the County Highway Agency.