US Bridges

Cth T over Big Somo River

PoorPosted for load

Lincoln County, Wisconsin · 1.3M S JCT Ush 8 · Structure no. P35004400000000

Built
1971
54 years old
Condition
Poor
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
74 ft
1 main span
Daily traffic
86
2023 count
Owner
County
County Highway Agency

About this bridge

Cth T over Big Somo River is a prestressed concrete box beam or girders - multiple carrying Cth T over Big Somo River in Lincoln County, Wisconsin. It was built in 1971, so it is 54 years old, older 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. Its operating status is: posted for load restriction.

It carries about 86 vehicles a day, projected to reach 88 by 2043. The structure is 74 ft (22.6 m) long and 30 ft wide. If it were closed, the detour would be 12.4 mi (20 km).

CarriesCth T
CrossesBig Somo River
Location1.3M S JCT Ush 8
RouteCounty Highway 0T
Coordinates45.53671, -89.97
Functional classRural Minor Collector

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.8 US tons
Inventory rating16.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length74 ft (22.6 m)
Longest span69 ft (21 m)
Deck width30 ft (9.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic86 (2023)
Projected traffic88 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed12.4 mi (20 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$384,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth T over Big Somo River built?

It was built in 1971, making it 54 years old in 2025.

What condition is Cth T over Big Somo 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 June 2024.

How much traffic does Cth T over Big Somo River carry?

About 86 vehicles per day (2023 count).

How long is Cth T over Big Somo River?

The structure is 74 ft (22.6 m) long with a longest span of 69 ft (21 m) and a deck 30 ft wide.

Who owns Cth T over Big Somo River?

It is owned by the County Highway Agency.