US Bridges

Cth M over Kelly Brook

PoorPosted for load

Oconto County, Wisconsin · 0.9M W JCT Cth K · Structure no. P42092100000000

Built
1976
49 years old
Condition
Poor
inspected October 2024
Type
Slab
Concrete
Length
29 ft
1 main span
Daily traffic
680
2022 count
Owner
County
County Highway Agency

About this bridge

Cth M over Kelly Brook is a concrete slab carrying Cth M over Kelly Brook in Oconto County, Wisconsin. It was built in 1976, so it is 49 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 680 vehicles a day, projected to reach 816 by 2042. The structure is 29 ft (8.7 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCth M
CrossesKelly Brook
Location0.9M W JCT Cth K
RouteCounty Highway 0M
CountyOconto County
StateWisconsin
Coordinates45.00444, -88.24278
Functional classRural Major 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating30.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length29 ft (8.7 m)
Longest span27 ft (8.2 m)
Deck width36 ft (10.9 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic680 (2022)
Projected traffic816 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$187,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth M over Kelly Brook built?

It was built in 1976, making it 49 years old in 2025.

What condition is Cth M over Kelly Brook 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 October 2024.

How much traffic does Cth M over Kelly Brook carry?

About 680 vehicles per day (2022 count).

How long is Cth M over Kelly Brook?

The structure is 29 ft (8.7 m) long with a longest span of 27 ft (8.2 m) and a deck 36 ft wide.

Who owns Cth M over Kelly Brook?

It is owned by the County Highway Agency.