US Bridges

Mn 76 over S Fk Root River

Fair

Houston County, Minnesota · 2.8 MI S of W JCT TH 16 · Structure no. 6679

Built
1948
77 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
314 ft
3 main spans
Daily traffic
1,386
2022 count
Owner
State
State Highway Agency

About this bridge

Mn 76 over S Fk Root River is a steel continuous stringer/multi-beam or girder carrying Mn 76 over S Fk Root River in Houston County, Minnesota. It was built in 1948, so it is 77 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 1,386 vehicles a day, roughly 16% of them trucks, projected to reach 1,650 by 2042. The structure is 314 ft (95.7 m) long and 35 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

Open in Google Maps
CarriesMn 76
CrossesS Fk Root River
Location2.8 MI S of W JCT TH 16
RouteState Highway 76
CountyHouston County
StateMinnesota
Coordinates43.73869, -91.56423
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating32.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadH 20
Structure length314 ft (95.7 m)
Longest span100 ft (30.5 m)
Deck width35 ft (10.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,386 (2022)
Projected traffic1,650 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mn 76 over S Fk Root River built?

It was built in 1948, making it 77 years old in 2025.

What condition is Mn 76 over S Fk Root 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 May 2024.

How much traffic does Mn 76 over S Fk Root River carry?

About 1,386 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is Mn 76 over S Fk Root River?

The structure is 314 ft (95.7 m) long with a longest span of 100 ft (30.5 m) and a deck 35 ft wide.

Who owns Mn 76 over S Fk Root River?

It is owned by the State Highway Agency.