US Bridges

Csah 139 over Little Fork River

Good

St. Louis County, Minnesota · 0.6 MI N of JCT TH 1 · Structure no. 69530

Built
1983
42 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
305 ft
3 main spans
Daily traffic
35
2019 count
Owner
County
County Highway Agency

About this bridge

Csah 139 over Little Fork River is a prestressed concrete stringer/multi-beam or girder carrying Csah 139 over Little Fork River in St. Louis County, Minnesota. It was built in 1983, so it is 42 years old, older than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 35 vehicles a day, projected to reach 35 by 2039. The structure is 305 ft (93.1 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesCsah 139
CrossesLittle Fork River
Location0.6 MI N of JCT TH 1
RouteCounty Highway 139
Coordinates47.87181, -92.95502
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating65.9 US tons
Inventory rating40 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length305 ft (93.1 m)
Longest span99 ft (30.2 m)
Deck width27 ft (8.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2019)
Projected traffic35 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 139 over Little Fork River built?

It was built in 1983, making it 42 years old in 2025.

What condition is Csah 139 over Little Fork River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Csah 139 over Little Fork River carry?

About 35 vehicles per day (2019 count).

How long is Csah 139 over Little Fork River?

The structure is 305 ft (93.1 m) long with a longest span of 99 ft (30.2 m) and a deck 27 ft wide.

Who owns Csah 139 over Little Fork River?

It is owned by the County Highway Agency.