US Bridges

Mn 77 over I 494

Good

Hennepin County, Minnesota · At the JCT TH 77; 494 · Structure no. 9081

Built
1958
67 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
166 ft
2 main spans
Daily traffic
19,500
2017 count
Owner
State
State Highway Agency

About this bridge

Mn 77 over I 494 is a prestressed concrete stringer/multi-beam or girder carrying Mn 77 over I 494 in Hennepin County, Minnesota. It was built in 1958, so it is 67 years old, older 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 19,500 vehicles a day, roughly 3% of them trucks, projected to reach 19,500 by 2039. The structure is 166 ft (50.7 m) long and 44 ft wide.

CarriesMn 77
CrossesI 494
LocationAt the JCT TH 77; 494
RouteState Highway 77
Coordinates44.8622, -93.24751
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.5 US tons
Inventory rating50.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length166 ft (50.7 m)
Longest span81 ft (24.7 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,500 (2017)
Projected traffic19,500 by 2039
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 Mn 77 over I 494 built?

It was built in 1958, making it 67 years old in 2025.

What condition is Mn 77 over I 494 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 July 2024.

How much traffic does Mn 77 over I 494 carry?

About 19,500 vehicles per day (2017 count), of which roughly 3% are trucks.

How long is Mn 77 over I 494?

The structure is 166 ft (50.7 m) long with a longest span of 81 ft (24.7 m) and a deck 44 ft wide.

Who owns Mn 77 over I 494?

It is owned by the State Highway Agency.