US Bridges

Csah 17 over Split Rock River

FairPosted for load

Carlton County, Minnesota · 0.2 MI S of JCT TH 27 · Structure no. L1211

Built
1961
64 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
30 ft
1 main span
Daily traffic
89
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 17 over Split Rock River is a steel stringer/multi-beam or girder carrying Csah 17 over Split Rock River in Carlton County, Minnesota. It was built in 1961, so it is 64 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. Its operating status is: posted for load restriction.

It carries about 89 vehicles a day, projected to reach 70 by 2042. The structure is 30 ft (9.2 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCsah 17
CrossesSplit Rock River
Location0.2 MI S of JCT TH 27
RouteCounty Highway 17
CountyCarlton County
StateMinnesota
Coordinates46.44676, -92.94874
Functional classRural Major 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.7 US tons
Inventory rating19 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length30 ft (9.2 m)
Longest span28 ft (8.4 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic89 (2022)
Projected traffic70 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 17 over Split Rock River built?

It was built in 1961, making it 64 years old in 2025.

What condition is Csah 17 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 Csah 17 over Split Rock River carry?

About 89 vehicles per day (2022 count).

How long is Csah 17 over Split Rock River?

The structure is 30 ft (9.2 m) long with a longest span of 28 ft (8.4 m) and a deck 25 ft wide.

Who owns Csah 17 over Split Rock River?

It is owned by the County Highway Agency.