US Bridges

Csah 31 over I 494

Fair

Dakota County, Minnesota · 1.1 MI W of JCT TH 35E · Structure no. 19826

Built
1972
53 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
216 ft
2 main spans
Daily traffic
13,863
2021 count
Owner
State
State Highway Agency

About this bridge

Csah 31 over I 494 is a prestressed concrete stringer/multi-beam or girder carrying Csah 31 over I 494 in Dakota County, Minnesota. It was built in 1972, so it is 53 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 5 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 13,863 vehicles a day, projected to reach 19,100 by 2041. The structure is 216 ft (65.8 m) long and 95 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCsah 31
CrossesI 494
Location1.1 MI W of JCT TH 35E
RouteCounty Highway 31
CountyDakota County
StateMinnesota
Coordinates44.86119, -93.16714
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.1 US tons
Inventory rating23 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length216 ft (65.8 m)
Longest span106 ft (32.2 m)
Deck width95 ft (29 m)
Roadway width78 ft (23.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,863 (2021)
Projected traffic19,100 by 2041
Trucks—
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Csah 31 over I 494 built?

It was built in 1972, making it 53 years old in 2025.

What condition is Csah 31 over I 494 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 October 2023.

How much traffic does Csah 31 over I 494 carry?

About 13,863 vehicles per day (2021 count).

How long is Csah 31 over I 494?

The structure is 216 ft (65.8 m) long with a longest span of 106 ft (32.2 m) and a deck 95 ft wide.

Who owns Csah 31 over I 494?

It is owned by the State Highway Agency.