US Bridges

Sth 122 over Montreal River

Fair

Iron County, Wisconsin · 0.6M N JCT Cth a · Structure no. B26067100000000

Built
1928
97 years old, rebuilt 1986
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
100 ft
2 main spans
Daily traffic
280
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 122 over Montreal River is a steel stringer/multi-beam or girder carrying Sth 122 over Montreal River in Iron County, Wisconsin. It was built in 1928 and reconstructed in 1986, so it is 97 years old, older than the Wisconsin average of 40.3 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 280 vehicles a day, roughly 9% of them trucks, projected to reach 370 by 2043. The structure is 100 ft (30.5 m) long and 32 ft wide. If it were closed, the detour would be 34.8 mi (56 km).

Location

Open in Google Maps
CarriesSth 122
CrossesMontreal River
Location0.6M N JCT Cth a
RouteState Highway 122
CountyIron County
StateWisconsin
Coordinates46.55712, -90.41447
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating73.9 US tons
Inventory rating42.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length100 ft (30.5 m)
Longest span49 ft (14.8 m)
Deck width32 ft (9.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic280 (2022)
Projected traffic370 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.8 mi (56 km)
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sth 122 over Montreal River built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1986.

What condition is Sth 122 over Montreal 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 July 2024.

How much traffic does Sth 122 over Montreal River carry?

About 280 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Sth 122 over Montreal River?

The structure is 100 ft (30.5 m) long with a longest span of 49 ft (14.8 m) and a deck 32 ft wide.

Who owns Sth 122 over Montreal River?

It is owned by the State Highway Agency.