US Bridges

Sth 13-8th ST over Nepco Lake

Fair

Wood County, Wisconsin · 2.5M N JCT Sth 73 (a) · Structure no. B71006200000000

Built
1988
37 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
98 ft
3 main spans
Daily traffic
11,200
2021 count
Owner
State
State Highway Agency

About this bridge

Sth 13-8th ST over Nepco Lake is a concrete continuous slab carrying Sth 13-8th ST over Nepco Lake in Wood County, Wisconsin. It was built in 1988, so it is 37 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 11,200 vehicles a day, roughly 5% of them trucks, projected to reach 13,440 by 2041. The structure is 98 ft (29.8 m) long and 72 ft wide. If it were closed, the detour would be 13.7 mi (22 km).

Location

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CarriesSth 13-8th ST
CrossesNepco Lake
Location2.5M N JCT Sth 73 (a)
RouteState Highway 13
CountyWood County
StateWisconsin
Coordinates44.34173, -89.81596
Functional classUrban Other Principal 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 rating73.9 US tons
Inventory rating42.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length98 ft (29.8 m)
Longest span38 ft (11.6 m)
Deck width72 ft (21.9 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,200 (2021)
Projected traffic13,440 by 2041
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13.7 mi (22 km)
TollOn a free road
National Highway SystemYes

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 13-8th ST over Nepco Lake built?

It was built in 1988, making it 37 years old in 2025.

What condition is Sth 13-8th ST over Nepco Lake 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 2023.

How much traffic does Sth 13-8th ST over Nepco Lake carry?

About 11,200 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Sth 13-8th ST over Nepco Lake?

The structure is 98 ft (29.8 m) long with a longest span of 38 ft (11.6 m) and a deck 72 ft wide.

Who owns Sth 13-8th ST over Nepco Lake?

It is owned by the State Highway Agency.