US Bridges

Cth G over Trappe River

Fair

Marathon County, Wisconsin · 0.7M E JCT Cth J · Structure no. B37010300000000

Built
1964
61 years old, rebuilt 2017
Condition
Fair
inspected October 2023
Type
Slab
Concrete Continuous
Length
100 ft
2 main spans
Daily traffic
143
2023 count
Owner
County
County Highway Agency

About this bridge

Cth G over Trappe River is a concrete continuous slab carrying Cth G over Trappe River in Marathon County, Wisconsin. It was built in 1964 and reconstructed in 2017, so it is 61 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 143 vehicles a day, projected to reach 552 by 2042. The structure is 100 ft (30.4 m) long and 31 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

Open in Google Maps
CarriesCth G
CrossesTrappe River
Location0.7M E JCT Cth J
RouteCounty Highway 0G
CountyMarathon County
StateWisconsin
Coordinates45.09718, -89.47854
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.9 US tons
Inventory rating40.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length100 ft (30.4 m)
Longest span49 ft (14.9 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic143 (2023)
Projected traffic552 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth G over Trappe River built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2017.

What condition is Cth G over Trappe 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 October 2023.

How much traffic does Cth G over Trappe River carry?

About 143 vehicles per day (2023 count).

How long is Cth G over Trappe River?

The structure is 100 ft (30.4 m) long with a longest span of 49 ft (14.9 m) and a deck 31 ft wide.

Who owns Cth G over Trappe River?

It is owned by the County Highway Agency.