US Bridges

Csah 12 over Turtle River

Fair

Beltrami County, Minnesota · 2.1 MI W of JCT Csah 39 · Structure no. 04507

Built
1971
54 years old
Condition
Fair
inspected September 2024
Type
Channel Beam
Prestressed Concrete
Length
93 ft
3 main spans
Daily traffic
500
2020 count
Owner
County
County Highway Agency

About this bridge

Csah 12 over Turtle River is a prestressed concrete channel beam carrying Csah 12 over Turtle River in Beltrami County, Minnesota. It was built in 1971, so it is 54 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.

It carries about 500 vehicles a day, projected to reach 490 by 2040. The structure is 93 ft (28.4 m) long and 35 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCsah 12
CrossesTurtle River
Location2.1 MI W of JCT Csah 39
RouteCounty Highway 12
CountyBeltrami County
StateMinnesota
Coordinates47.48023, -94.52331
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating57.7 US tons
Inventory rating34.6 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length93 ft (28.4 m)
Longest span31 ft (9.5 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2020)
Projected traffic490 by 2040
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 12 over Turtle River built?

It was built in 1971, making it 54 years old in 2025.

What condition is Csah 12 over Turtle 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 September 2024.

How much traffic does Csah 12 over Turtle River carry?

About 500 vehicles per day (2020 count).

How long is Csah 12 over Turtle River?

The structure is 93 ft (28.4 m) long with a longest span of 31 ft (9.5 m) and a deck 35 ft wide.

Who owns Csah 12 over Turtle River?

It is owned by the County Highway Agency.