US Bridges

Cth G over Castle Rock Flowage

Fair

Juneau County, Wisconsin · 2.4M S JCT Cth Q · Structure no. B29007100000000

Built
1982
43 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
168 ft
3 main spans
Daily traffic
904
2022 count
Owner
County
County Highway Agency

About this bridge

Cth G over Castle Rock Flowage is a concrete continuous slab carrying Cth G over Castle Rock Flowage in Juneau County, Wisconsin. It was built in 1982, so it is 43 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 5 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 904 vehicles a day, projected to reach 994 by 2042. The structure is 168 ft (51.1 m) long and 35 ft wide. If it were closed, the detour would be 17.4 mi (28 km).

Location

Open in Google Maps
CarriesCth G
CrossesCastle Rock Flowage
Location2.4M S JCT Cth Q
RouteCounty Highway 0G
CountyJuneau County
StateWisconsin
Coordinates43.94663, -90.03453
Functional classRural Major 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.7 US tons
Inventory rating42.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length168 ft (51.1 m)
Longest span66 ft (20.1 m)
Deck width35 ft (10.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic904 (2022)
Projected traffic994 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed17.4 mi (28 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 Castle Rock Flowage built?

It was built in 1982, making it 43 years old in 2025.

What condition is Cth G over Castle Rock Flowage 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 May 2023.

How much traffic does Cth G over Castle Rock Flowage carry?

About 904 vehicles per day (2022 count).

How long is Cth G over Castle Rock Flowage?

The structure is 168 ft (51.1 m) long with a longest span of 66 ft (20.1 m) and a deck 35 ft wide.

Who owns Cth G over Castle Rock Flowage?

It is owned by the County Highway Agency.