US Bridges

Sth 77 over Namekagon River

Fair

Sawyer County, Wisconsin · 1.2M E JCT Ush 63 to N · Structure no. B57006100000000

Built
2000
25 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
115 ft
2 main spans
Daily traffic
6,200
2021 count
Owner
State
State Highway Agency

About this bridge

Sth 77 over Namekagon River is a prestressed concrete continuous stringer/multi-beam or girder carrying Sth 77 over Namekagon River in Sawyer County, Wisconsin. It was built in 2000, so it is 25 years old, younger 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 6,200 vehicles a day, roughly 11% of them trucks, projected to reach 7,440 by 2041. The structure is 115 ft (35.2 m) long and 45 ft wide. If it were closed, the detour would be 43.5 mi (70 km).

Location

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CarriesSth 77
CrossesNamekagon River
Location1.2M E JCT Ush 63 to N
RouteState Highway 77
CountySawyer County
StateWisconsin
Coordinates46.01068, -91.45745
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable 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 rating62.8 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length115 ft (35.2 m)
Longest span56 ft (17 m)
Deck width45 ft (13.8 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,200 (2021)
Projected traffic7,440 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed43.5 mi (70 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 over Namekagon River built?

It was built in 2000, making it 25 years old in 2025.

What condition is Sth 77 over Namekagon 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 September 2023.

How much traffic does Sth 77 over Namekagon River carry?

About 6,200 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is Sth 77 over Namekagon River?

The structure is 115 ft (35.2 m) long with a longest span of 56 ft (17 m) and a deck 45 ft wide.

Who owns Sth 77 over Namekagon River?

It is owned by the State Highway Agency.