US Bridges

Csah 31 over Lac Qui Parle River

Good

Lac qui Parle County, Minnesota · 0.9 MI S of JCT Csah 20 · Structure no. 37547

Built
2004
21 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
170 ft
3 main spans
Daily traffic
180
2016 count
Owner
County
County Highway Agency

About this bridge

Csah 31 over Lac Qui Parle River is a prestressed concrete stringer/multi-beam or girder carrying Csah 31 over Lac Qui Parle River in Lac qui Parle County, Minnesota. It was built in 2004, so it is 21 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 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 180 vehicles a day, roughly 15% of them trucks, projected to reach 180 by 2039. The structure is 170 ft (51.7 m) long and 39 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesCsah 31
CrossesLac Qui Parle River
Location0.9 MI S of JCT Csah 20
RouteCounty Highway 31
Coordinates44.99517, -95.91983
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.2 US tons
Inventory rating45 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length170 ft (51.7 m)
Longest span56 ft (17.2 m)
Deck width39 ft (12 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180 (2016)
Projected traffic180 by 2039
Trucks15%
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 Lac Qui Parle River built?

It was built in 2004, making it 21 years old in 2025.

What condition is Csah 31 over Lac Qui Parle 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 August 2024.

How much traffic does Csah 31 over Lac Qui Parle River carry?

About 180 vehicles per day (2016 count), of which roughly 15% are trucks.

How long is Csah 31 over Lac Qui Parle River?

The structure is 170 ft (51.7 m) long with a longest span of 56 ft (17.2 m) and a deck 39 ft wide.

Who owns Csah 31 over Lac Qui Parle River?

It is owned by the County Highway Agency.