US Bridges

Sth 21 over IH Ush 51-IH 39

Fair

Waushara County, Wisconsin · At JCT Sth 21-USH 51 · Structure no. B69002000000000

Built
1985
40 years old, rebuilt 2015
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
254 ft
2 main spans
Daily traffic
4,400
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 21 over IH Ush 51-IH 39 is a steel continuous stringer/multi-beam or girder carrying Sth 21 over IH Ush 51-IH 39 in Waushara County, Wisconsin. It was built in 1985 and reconstructed in 2015, so it is 40 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 4,400 vehicles a day, roughly 9% of them trucks, projected to reach 5,280 by 2042. The structure is 254 ft (77.4 m) long and 71 ft wide. If it were closed, the detour would be 13.7 mi (22 km).

Location

Open in Google Maps
CarriesSth 21
CrossesIH Ush 51-IH 39
LocationAt JCT Sth 21-USH 51
RouteState Highway 21
CountyWaushara County
StateWisconsin
Coordinates44.03504, -89.52928
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.1 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length254 ft (77.4 m)
Longest span131 ft (39.9 m)
Deck width71 ft (21.6 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,400 (2022)
Projected traffic5,280 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed13.7 mi (22 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sth 21 over IH Ush 51-IH 39 built?

It was built in 1985, making it 40 years old in 2025. It was reconstructed in 2015.

What condition is Sth 21 over IH Ush 51-IH 39 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 2024.

How much traffic does Sth 21 over IH Ush 51-IH 39 carry?

About 4,400 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Sth 21 over IH Ush 51-IH 39?

The structure is 254 ft (77.4 m) long with a longest span of 131 ft (39.9 m) and a deck 71 ft wide.

Who owns Sth 21 over IH Ush 51-IH 39?

It is owned by the State Highway Agency.