US Bridges

T 230 over Split Rock River

Fair

Carlton County, Minnesota · 1.0 MI S of JCT TH 27 · Structure no. L6410

Built
1985
40 years old
Condition
Fair
inspected December 2024
Type
Culvert
Concrete
Length
51 ft
3 main spans
Daily traffic
35
1984 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

T 230 over Split Rock River is a concrete culvert carrying T 230 over Split Rock River in Carlton County, Minnesota. It was built in 1985, so it is 40 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 35 vehicles a day, projected to reach 35 by 2029. The structure is 51 ft (15.5 m) long. If it were closed, the detour would be 8.1 mi (13 km).

CarriesT 230
CrossesSplit Rock River
Location1.0 MI S of JCT TH 27
RouteCounty Highway 230
Coordinates46.43565, -92.90844
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating59.4 US tons
Inventory rating39.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span14 ft (4.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (1984)
Projected traffic35 by 2029
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

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 T 230 over Split Rock River built?

It was built in 1985, making it 40 years old in 2025.

What condition is T 230 over Split 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 December 2024.

How much traffic does T 230 over Split Rock River carry?

About 35 vehicles per day (1984 count).

How long is T 230 over Split Rock River?

The structure is 51 ft (15.5 m) long with a longest span of 14 ft (4.4 m).

Who owns T 230 over Split Rock River?

It is owned by the Town or Township Highway Agency.