US Bridges

Csah 1 over Big Fork River

Good

Koochiching County, Minnesota · 1.0 MI NW of JCT Csah 13 · Structure no. 36528

Built
2008
17 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
424 ft
4 main spans
Daily traffic
55
2008 count
Owner
County
County Highway Agency

About this bridge

Csah 1 over Big Fork River is a steel continuous stringer/multi-beam or girder carrying Csah 1 over Big Fork River in Koochiching County, Minnesota. It was built in 2008, so it is 17 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 55 vehicles a day, projected to reach 55 by 2031. The structure is 424 ft (129.2 m) long and 39 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

CarriesCsah 1
CrossesBig Fork River
Location1.0 MI NW of JCT Csah 13
RouteCounty Highway 1
Coordinates48.41065, -93.78439
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating69.8 US tons
Inventory rating41.8 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length424 ft (129.2 m)
Longest span133 ft (40.5 m)
Deck width39 ft (12 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic55 (2008)
Projected traffic55 by 2031
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 1 over Big Fork River built?

It was built in 2008, making it 17 years old in 2025.

What condition is Csah 1 over Big 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 1 over Big Fork River carry?

About 55 vehicles per day (2008 count).

How long is Csah 1 over Big Fork River?

The structure is 424 ft (129.2 m) long with a longest span of 133 ft (40.5 m) and a deck 39 ft wide.

Who owns Csah 1 over Big Fork River?

It is owned by the County Highway Agency.