US Bridges

Sth 77-SILVER ST over Montreal River

Fair

Iron County, Wisconsin · 0.2M E JCT Ush 51 · Structure no. B26000900000000

Built
1965
60 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
51 ft
1 main span
Daily traffic
4,900
2023 count
Owner
State
State Highway Agency

About this bridge

Sth 77-SILVER ST over Montreal River is a steel stringer/multi-beam or girder carrying Sth 77-SILVER ST over Montreal River in Iron County, Wisconsin. It was built in 1965, so it is 60 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 6 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 4,900 vehicles a day, roughly 9% of them trucks, projected to reach 9,140 by 2043. The structure is 51 ft (15.5 m) long and 68 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

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CarriesSth 77-SILVER ST
CrossesMontreal River
Location0.2M E JCT Ush 51
RouteState Highway 77
CountyIron County
StateWisconsin
Coordinates46.44992, -90.17846
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span50 ft (15.2 m)
Deck width68 ft (20.8 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,900 (2023)
Projected traffic9,140 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5.6 mi (9 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 77-SILVER ST over Montreal River built?

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

What condition is Sth 77-SILVER ST 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 77-SILVER ST over Montreal River carry?

About 4,900 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Sth 77-SILVER ST over Montreal River?

The structure is 51 ft (15.5 m) long with a longest span of 50 ft (15.2 m) and a deck 68 ft wide.

Who owns Sth 77-SILVER ST over Montreal River?

It is owned by the State Highway Agency.