US Bridges

Sth 104 over Allen Creek

Fair

Rock County, Wisconsin · 0.7M N JCT Sth 59 E · Structure no. B53016800000000

Built
1993
32 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
72 ft
2 main spans
Daily traffic
3,000
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 104 over Allen Creek is a concrete continuous slab carrying Sth 104 over Allen Creek in Rock County, Wisconsin. It was built in 1993, so it is 32 years old, younger 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 3,000 vehicles a day, roughly 8% of them trucks, projected to reach 3,600 by 2042. The structure is 72 ft (21.9 m) long and 36 ft wide. If it were closed, the detour would be 17.4 mi (28 km).

Location

Open in Google Maps
CarriesSth 104
CrossesAllen Creek
Location0.7M N JCT Sth 59 E
RouteState Highway 104
CountyRock County
StateWisconsin
Coordinates42.74609, -89.36856
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 rating77.4 US tons
Inventory rating44.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length72 ft (21.9 m)
Longest span35 ft (10.7 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2022)
Projected traffic3,600 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed17.4 mi (28 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sth 104 over Allen Creek built?

It was built in 1993, making it 32 years old in 2025.

What condition is Sth 104 over Allen Creek 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 September 2023.

How much traffic does Sth 104 over Allen Creek carry?

About 3,000 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Sth 104 over Allen Creek?

The structure is 72 ft (21.9 m) long with a longest span of 35 ft (10.7 m) and a deck 36 ft wide.

Who owns Sth 104 over Allen Creek?

It is owned by the State Highway Agency.