US Bridges

Csah 31 over I 35E SB Off Ramp

Fair

Dakota County, Minnesota · 2.5 MI SW of JCT TH 494 · Structure no. 19818

Built
1984
41 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
452 ft
3 main spans
Daily traffic
30,500
2017 count
Owner
State
State Highway Agency

About this bridge

Csah 31 over I 35E SB Off Ramp is a steel continuous stringer/multi-beam or girder carrying Csah 31 over I 35E SB Off Ramp in Dakota County, Minnesota. It was built in 1984, so it is 41 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 30,500 vehicles a day, projected to reach 30,500 by 2039. The structure is 452 ft (137.7 m) long and 104 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCsah 31
CrossesI 35E SB Off Ramp
Location2.5 MI SW of JCT TH 494
RouteCounty Highway 31
CountyDakota County
StateMinnesota
Coordinates44.83061, -93.16729
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 inspectionJune 2024
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.7 US tons
Inventory rating52.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length452 ft (137.7 m)
Longest span170 ft (51.8 m)
Deck width104 ft (31.6 m)
Roadway width84 ft (25.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,500 (2017)
Projected traffic30,500 by 2039
Trucks—
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 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$1,000 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Csah 31 over I 35E SB Off Ramp built?

It was built in 1984, making it 41 years old in 2025.

What condition is Csah 31 over I 35E SB Off Ramp 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 June 2024.

How much traffic does Csah 31 over I 35E SB Off Ramp carry?

About 30,500 vehicles per day (2017 count).

How long is Csah 31 over I 35E SB Off Ramp?

The structure is 452 ft (137.7 m) long with a longest span of 170 ft (51.8 m) and a deck 104 ft wide.

Who owns Csah 31 over I 35E SB Off Ramp?

It is owned by the State Highway Agency.