US Bridges

Sth 27 over Namekagon River

Poor

Sawyer County, Wisconsin · 0.1M N JCT Cth B · Structure no. B57005800000000

Built
1996
29 years old
Condition
Poor
inspected September 2024
Type
Slab
Concrete Continuous
Length
141 ft
3 main spans
Daily traffic
13,500
2021 count
Owner
State
State Highway Agency

About this bridge

Sth 27 over Namekagon River is a concrete continuous slab carrying Sth 27 over Namekagon River in Sawyer County, Wisconsin. It was built in 1996, so it is 29 years old, younger than the Wisconsin average of 40.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 13,500 vehicles a day, roughly 5% of them trucks, projected to reach 16,200 by 2041. The structure is 141 ft (43 m) long and 73 ft wide. If it were closed, the detour would be 20.5 mi (33 km).

CarriesSth 27
CrossesNamekagon River
Location0.1M N JCT Cth B
RouteState Highway 27
Coordinates46.00888, -91.48159
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating64.8 US tons
Inventory rating37.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length141 ft (43 m)
Longest span56 ft (17.1 m)
Deck width73 ft (22.3 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,500 (2021)
Projected traffic16,200 by 2041
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed20.5 mi (33 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$885,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Sth 27 over Namekagon River built?

It was built in 1996, making it 29 years old in 2025.

What condition is Sth 27 over Namekagon River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does Sth 27 over Namekagon River carry?

About 13,500 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Sth 27 over Namekagon River?

The structure is 141 ft (43 m) long with a longest span of 56 ft (17.1 m) and a deck 73 ft wide.

Who owns Sth 27 over Namekagon River?

It is owned by the State Highway Agency.