US Bridges

Mn 123 over Kettle River; ST

Fair

Pine County, Minnesota · 1.5 MI NE of S JCT 23 · Structure no. 5718

Built
1948
77 years old
Condition
Fair
inspected August 2024
Type
Truss - Deck
Steel Continuous
Length
403 ft
3 main spans
Daily traffic
2,320
2021 count
Owner
State
State Highway Agency

About this bridge

Mn 123 over Kettle River; ST is a steel continuous truss - deck carrying Mn 123 over Kettle River; ST in Pine 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 2,320 vehicles a day, roughly 4% of them trucks, projected to reach 2,850 by 2041. The structure is 403 ft (122.8 m) long and 40 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesMn 123
CrossesKettle River; ST
Location1.5 MI NE of S JCT 23
RouteState Highway 123
CountyPine County
StateMinnesota
Coordinates46.12891, -92.85662
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating20.9 US tons

Structure

Structure typeTruss - Deck
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length403 ft (122.8 m)
Longest span200 ft (61 m)
Deck width40 ft (12.1 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,320 (2021)
Projected traffic2,850 by 2041
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$1,000 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Mn 123 over Kettle River; ST built?

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

What condition is Mn 123 over Kettle River; ST 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 August 2024.

How much traffic does Mn 123 over Kettle River; ST carry?

About 2,320 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is Mn 123 over Kettle River; ST?

The structure is 403 ft (122.8 m) long with a longest span of 200 ft (61 m) and a deck 40 ft wide.

Who owns Mn 123 over Kettle River; ST?

It is owned by the State Highway Agency.