US Bridges

Sth 77-WISCONSIN a over W Br Montreal River

Fair

Iron County, Wisconsin · 5.7M E JCT Cth E · Structure no. B26001500000000

Built
1981
44 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
74 ft
1 main span
Daily traffic
2,700
2023 count
Owner
State
State Highway Agency

About this bridge

Sth 77-WISCONSIN a over W Br Montreal River is a prestressed concrete stringer/multi-beam or girder carrying Sth 77-WISCONSIN a over W Br Montreal River in Iron County, Wisconsin. It was built in 1981, so it is 44 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 2,700 vehicles a day, roughly 7% of them trucks, projected to reach 4,060 by 2043. The structure is 74 ft (22.6 m) long and 41 ft wide. If it were closed, the detour would be 44.7 mi (72 km).

Location

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CarriesSth 77-WISCONSIN a
CrossesW Br Montreal River
Location5.7M E JCT Cth E
RouteState Highway 77
CountyIron County
StateWisconsin
Coordinates46.43137, -90.23012
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.2 US tons
Inventory rating32.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length74 ft (22.6 m)
Longest span72 ft (21.9 m)
Deck width41 ft (12.6 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,700 (2023)
Projected traffic4,060 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed44.7 mi (72 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-WISCONSIN a over W Br Montreal River built?

It was built in 1981, making it 44 years old in 2025.

What condition is Sth 77-WISCONSIN a over W Br 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-WISCONSIN a over W Br Montreal River carry?

About 2,700 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Sth 77-WISCONSIN a over W Br Montreal River?

The structure is 74 ft (22.6 m) long with a longest span of 72 ft (21.9 m) and a deck 41 ft wide.

Who owns Sth 77-WISCONSIN a over W Br Montreal River?

It is owned by the State Highway Agency.