US Bridges

I 35 over Willow River

Good

Pine County, Minnesota · 1.0 MI N of JCT Csah 43 · Structure no. 58812

Built
1965
60 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
168 ft
3 main spans
Daily traffic
7,750
2016 count
Owner
State
State Highway Agency

About this bridge

I 35 over Willow River is a prestressed concrete stringer/multi-beam or girder carrying I 35 over Willow River in Pine County, Minnesota. It was built in 1965, so it is 60 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 7,750 vehicles a day, roughly 8% of them trucks, projected to reach 7,750 by 2036. The structure is 168 ft (51.1 m) long and 41 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesI 35
CrossesWillow River
Location1.0 MI N of JCT Csah 43
RouteInterstate 35
Coordinates46.33125, -92.82058
Functional classRural Principal Arterial - Interstate

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 inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93.6 US tons
Inventory rating59.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length168 ft (51.1 m)
Longest span55 ft (16.8 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,750 (2016)
Projected traffic7,750 by 2036
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I 35 over Willow River built?

It was built in 1965, making it 60 years old in 2025.

What condition is I 35 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 May 2024.

How much traffic does I 35 over Willow River carry?

About 7,750 vehicles per day (2016 count), of which roughly 8% are trucks.

How long is I 35 over Willow River?

The structure is 168 ft (51.1 m) long with a longest span of 55 ft (16.8 m) and a deck 41 ft wide.

Who owns I 35 over Willow River?

It is owned by the State Highway Agency.