US Bridges

Mn 23 over I 35

Fair

Pine County, Minnesota · 3.4 MI N of Sandstone · Structure no. 9791

Built
1959
66 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
261 ft
4 main spans
Daily traffic
2,033
2022 count
Owner
State
State Highway Agency

About this bridge

Mn 23 over I 35 is a steel continuous stringer/multi-beam or girder carrying Mn 23 over I 35 in Pine County, Minnesota. It was built in 1959, so it is 66 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 2,033 vehicles a day, roughly 4% of them trucks, projected to reach 2,450 by 2042. The structure is 261 ft (79.6 m) long and 35 ft wide.

Location

Open in Google Maps
CarriesMn 23
CrossesI 35
Location3.4 MI N of Sandstone
RouteState Highway 23
CountyPine County
StateMinnesota
Coordinates46.17106, -92.86612
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 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
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length261 ft (79.6 m)
Longest span78 ft (23.9 m)
Deck width35 ft (10.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,033 (2022)
Projected traffic2,450 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

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 23 over I 35 built?

It was built in 1959, making it 66 years old in 2025.

What condition is Mn 23 over I 35 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 23 over I 35 carry?

About 2,033 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Mn 23 over I 35?

The structure is 261 ft (79.6 m) long with a longest span of 78 ft (23.9 m) and a deck 35 ft wide.

Who owns Mn 23 over I 35?

It is owned by the State Highway Agency.