US Bridges

Csah 75 over Little Fork River

Fair

Koochiching County, Minnesota · 2.3 MI SE of JCT TH 65 · Structure no. 36517

Built
1985
40 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
323 ft
4 main spans
Daily traffic
25
2016 count
Owner
County
County Highway Agency

About this bridge

Csah 75 over Little Fork River is a steel continuous stringer/multi-beam or girder carrying Csah 75 over Little Fork River in Koochiching 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 25 vehicles a day, projected to reach 25 by 2039. The structure is 323 ft (98.3 m) long and 31 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesCsah 75
CrossesLittle Fork River
Location2.3 MI SE of JCT TH 65
RouteCounty Highway 75
CountyKoochiching County
StateMinnesota
Coordinates47.94951, -93.10268
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
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 evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating76.7 US tons
Inventory rating46.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length323 ft (98.3 m)
Longest span110 ft (33.5 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2016)
Projected traffic25 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 75 over Little Fork River built?

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

What condition is Csah 75 over Little Fork 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 75 over Little Fork River carry?

About 25 vehicles per day (2016 count).

How long is Csah 75 over Little Fork River?

The structure is 323 ft (98.3 m) long with a longest span of 110 ft (33.5 m) and a deck 31 ft wide.

Who owns Csah 75 over Little Fork River?

It is owned by the County Highway Agency.