US Bridges

Csah 85 over Vermillion River

Fair

Dakota County, Minnesota · 0.9 MI N of JCT Csah 62 · Structure no. 19504

Built
1968
57 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
137 ft
3 main spans
Daily traffic
1,173
2021 count
Owner
County
County Highway Agency

About this bridge

Csah 85 over Vermillion River is a steel continuous stringer/multi-beam or girder carrying Csah 85 over Vermillion River in Dakota County, Minnesota. It was built in 1968, so it is 57 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 1,173 vehicles a day, roughly 5% of them trucks, projected to reach 1,000 by 2041. The structure is 137 ft (41.9 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCsah 85
CrossesVermillion River
Location0.9 MI N of JCT Csah 62
RouteCounty Highway 85
CountyDakota County
StateMinnesota
Coordinates44.68636, -92.9542
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length137 ft (41.9 m)
Longest span52 ft (15.9 m)
Deck width34 ft (10.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,173 (2021)
Projected traffic1,000 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 85 over Vermillion River built?

It was built in 1968, making it 57 years old in 2025.

What condition is Csah 85 over Vermillion River 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 January 2024.

How much traffic does Csah 85 over Vermillion River carry?

About 1,173 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Csah 85 over Vermillion River?

The structure is 137 ft (41.9 m) long with a longest span of 52 ft (15.9 m) and a deck 34 ft wide.

Who owns Csah 85 over Vermillion River?

It is owned by the County Highway Agency.