US Bridges

Csah 66 over Mississippi River

Fair

Hennepin County, Minnesota · 0.4 MI W of JCT Csah 23 · Structure no. 27608

Built
1986
39 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
857 ft
4 main spans
Daily traffic
21,076
2021 count
Owner
County
County Highway Agency

About this bridge

Csah 66 over Mississippi River is a steel continuous stringer/multi-beam or girder carrying Csah 66 over Mississippi River in Hennepin County, Minnesota. It was built in 1986, so it is 39 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 21,076 vehicles a day, projected to reach 20,800 by 2041. The structure is 857 ft (261.1 m) long and 70 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCsah 66
CrossesMississippi River
Location0.4 MI W of JCT Csah 23
RouteCounty Highway 66
CountyHennepin County
StateMinnesota
Coordinates44.99899, -93.275
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.4 US tons
Inventory rating28.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length857 ft (261.1 m)
Longest span236 ft (71.9 m)
Deck width70 ft (21.4 m)
Roadway width52 ft (15.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,076 (2021)
Projected traffic20,800 by 2041
Trucks—
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Csah 66 over Mississippi River built?

It was built in 1986, making it 39 years old in 2025.

What condition is Csah 66 over Mississippi 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 June 2023.

How much traffic does Csah 66 over Mississippi River carry?

About 21,076 vehicles per day (2021 count).

How long is Csah 66 over Mississippi River?

The structure is 857 ft (261.1 m) long with a longest span of 236 ft (71.9 m) and a deck 70 ft wide.

Who owns Csah 66 over Mississippi River?

It is owned by the County Highway Agency.