US Bridges

CR 146 over Marble Creek

Fair

Blue Earth County, Minnesota · 0.8 MI S of JCT Csah 25 · Structure no. 90524

Built
1940
85 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
156
2021 count
Owner
County
County Highway Agency

About this bridge

CR 146 over Marble Creek is a concrete culvert carrying CR 146 over Marble Creek in Blue Earth County, Minnesota. It was built in 1940, so it is 85 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 156 vehicles a day, projected to reach 110 by 2041. The structure is 22 ft (6.7 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCR 146
CrossesMarble Creek
Location0.8 MI S of JCT Csah 25
RouteCounty Highway 146
CountyBlue Earth County
StateMinnesota
Coordinates43.92206, -94.26901
Functional classRural Local

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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating52.7 US tons
Inventory rating31.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic156 (2021)
Projected traffic110 by 2041
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$93 million
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 146 over Marble Creek built?

It was built in 1940, making it 85 years old in 2025.

What condition is CR 146 over Marble 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 2023.

How much traffic does CR 146 over Marble Creek carry?

About 156 vehicles per day (2021 count).

How long is CR 146 over Marble Creek?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 24 ft wide.

Who owns CR 146 over Marble Creek?

It is owned by the County Highway Agency.