US Bridges

M 91 over Mid Fk Zumbro R

Good

Olmsted County, Minnesota · 0.1 MI S of 5th ST · Structure no. 55033

Built
1985
40 years old
Condition
Good
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
166 ft
3 main spans
Daily traffic
525
2013 count
Owner
City
City or Municipal Highway Agency

About this bridge

M 91 over Mid Fk Zumbro R is a prestressed concrete stringer/multi-beam or girder carrying M 91 over Mid Fk Zumbro R in Olmsted County, Minnesota. It was built in 1985, so it is 40 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 525 vehicles a day, roughly 11% of them trucks, projected to reach 525 by 2029. The structure is 166 ft (50.7 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesM 91
CrossesMid Fk Zumbro R
Location0.1 MI S of 5th ST
RouteCity Street 91
Coordinates44.16605, -92.54646
Functional classRural Local

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95 US tons
Inventory rating46.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length166 ft (50.7 m)
Longest span54 ft (16.6 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic525 (2013)
Projected traffic525 by 2029
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 M 91 over Mid Fk Zumbro R built?

It was built in 1985, making it 40 years old in 2025.

What condition is M 91 over Mid Fk Zumbro R 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 December 2024.

How much traffic does M 91 over Mid Fk Zumbro R carry?

About 525 vehicles per day (2013 count), of which roughly 11% are trucks.

How long is M 91 over Mid Fk Zumbro R?

The structure is 166 ft (50.7 m) long with a longest span of 54 ft (16.6 m) and a deck 44 ft wide.

Who owns M 91 over Mid Fk Zumbro R?

It is owned by the City or Municipal Highway Agency.