US Bridges

Csah 31 over E Br Chippewa River

Good

Swift County, Minnesota · 0.8 MI N of JCT TH 9 · Structure no. 76506

Built
1978
47 years old
Condition
Good
inspected November 2023
Type
Tee Beam
Prestressed Concrete
Length
119 ft
3 main spans
Daily traffic
620
2017 count
Owner
County
County Highway Agency

About this bridge

Csah 31 over E Br Chippewa River is a prestressed concrete tee beam carrying Csah 31 over E Br Chippewa River in Swift County, Minnesota. It was built in 1978, so it is 47 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 620 vehicles a day, projected to reach 620 by 2039. The structure is 119 ft (36.4 m) long and 40 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesCsah 31
CrossesE Br Chippewa River
Location0.8 MI N of JCT TH 9
RouteCounty Highway 31
Coordinates45.33684, -95.45999
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.2 US tons
Inventory rating26.5 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length119 ft (36.4 m)
Longest span39 ft (12 m)
Deck width40 ft (12.2 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic620 (2017)
Projected traffic620 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 31 over E Br Chippewa River built?

It was built in 1978, making it 47 years old in 2025.

What condition is Csah 31 over E Br Chippewa 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 November 2023.

How much traffic does Csah 31 over E Br Chippewa River carry?

About 620 vehicles per day (2017 count).

How long is Csah 31 over E Br Chippewa River?

The structure is 119 ft (36.4 m) long with a longest span of 39 ft (12 m) and a deck 40 ft wide.

Who owns Csah 31 over E Br Chippewa River?

It is owned by the County Highway Agency.