US Bridges

Sth 21 over Dandy Creek

Good

Monroe County, Wisconsin · 0.7M E JCT Cth Pp · Structure no. B41020500000000

Built
2000
25 years old
Condition
Good
inspected October 2022
Type
Slab
Concrete
Length
43 ft
1 main span
Daily traffic
4,700
2021 count
Owner
State
State Highway Agency

About this bridge

Sth 21 over Dandy Creek is a concrete slab carrying Sth 21 over Dandy Creek in Monroe County, Wisconsin. It was built in 2000, so it is 25 years old, younger than the Wisconsin average of 40.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,700 vehicles a day, roughly 9% of them trucks, projected to reach 5,640 by 2041. The structure is 43 ft (13 m) long and 46 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesSth 21
CrossesDandy Creek
Location0.7M E JCT Cth Pp
RouteState Highway 21
Coordinates44.02588, -90.33913
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.6 US tons
Inventory rating44.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length43 ft (13 m)
Longest span40 ft (12.2 m)
Deck width46 ft (14 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,700 (2021)
Projected traffic5,640 by 2041
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemYes

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 21 over Dandy Creek built?

It was built in 2000, making it 25 years old in 2025.

What condition is Sth 21 over Dandy Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2022.

How much traffic does Sth 21 over Dandy Creek carry?

About 4,700 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is Sth 21 over Dandy Creek?

The structure is 43 ft (13 m) long with a longest span of 40 ft (12.2 m) and a deck 46 ft wide.

Who owns Sth 21 over Dandy Creek?

It is owned by the State Highway Agency.