US Bridges

Sth 21 over Carter Creek

Good

Adams County, Wisconsin · 0.6M E JCT Sth 13 · Structure no. B01003400000000

Built
2013
12 years old
Condition
Good
inspected May 2021
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
78 ft
1 main span
Daily traffic
3,600
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 21 over Carter Creek is a prestressed concrete stringer/multi-beam or girder carrying Sth 21 over Carter Creek in Adams County, Wisconsin. It was built in 2013, so it is 12 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,600 vehicles a day, projected to reach 4,560 by 2041. The structure is 78 ft (23.7 m) long and 47 ft wide. If it were closed, the detour would be 32.9 mi (53 km).

Location

Open in Google Maps
CarriesSth 21
CrossesCarter Creek
Location0.6M E JCT Sth 13
RouteState Highway 21
CountyAdams County
StateWisconsin
Coordinates44.02499, -89.79884
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionMay 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.8 US tons
Inventory rating41.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length78 ft (23.7 m)
Longest span74 ft (22.6 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,600 (2022)
Projected traffic4,560 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed32.9 mi (53 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

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 Carter Creek built?

It was built in 2013, making it 12 years old in 2025.

What condition is Sth 21 over Carter 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 May 2021.

How much traffic does Sth 21 over Carter Creek carry?

About 3,600 vehicles per day (2022 count).

How long is Sth 21 over Carter Creek?

The structure is 78 ft (23.7 m) long with a longest span of 74 ft (22.6 m) and a deck 47 ft wide.

Who owns Sth 21 over Carter Creek?

It is owned by the State Highway Agency.