US Bridges

Ut 8109 over Willow River

Good

St. Louis County, Minnesota · 0.3 MI S of JCT CSAH74 · Structure no. 69A17

Built
2014
11 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
70 ft
3 main spans
Daily traffic
40
2019 count
Owner
County
County Highway Agency

About this bridge

Ut 8109 over Willow River is a steel stringer/multi-beam or girder carrying Ut 8109 over Willow River in St. Louis County, Minnesota. It was built in 2014, so it is 11 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 40 vehicles a day, projected to reach 40 by 2039. The structure is 70 ft (21.3 m) long and 31 ft wide. If it were closed, the detour would be 123 mi (198 km).

Location

Open in Google Maps
CarriesUt 8109
CrossesWillow River
Location0.3 MI S of JCT CSAH74
RouteCounty Highway 8109
CountySt. Louis County
StateMinnesota
Coordinates47.96197, -92.95738
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.8 US tons
Inventory rating36.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans3
Design loadHL 93
Structure length70 ft (21.3 m)
Longest span26 ft (7.9 m)
Deck width31 ft (9.3 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2019)
Projected traffic40 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123 mi (198 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 Ut 8109 over Willow River built?

It was built in 2014, making it 11 years old in 2025.

What condition is Ut 8109 over Willow River 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 June 2023.

How much traffic does Ut 8109 over Willow River carry?

About 40 vehicles per day (2019 count).

How long is Ut 8109 over Willow River?

The structure is 70 ft (21.3 m) long with a longest span of 26 ft (7.9 m) and a deck 31 ft wide.

Who owns Ut 8109 over Willow River?

It is owned by the County Highway Agency.