US Bridges

Sth 21 over IH 94

Fair

Monroe County, Wisconsin · 0.2M E JCT Ush 12 · Structure no. B41025200000000

Built
2005
20 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
262 ft
2 main spans
Daily traffic
10,000
2021 count
Owner
State
State Highway Agency

About this bridge

Sth 21 over IH 94 is a prestressed concrete stringer/multi-beam or girder carrying Sth 21 over IH 94 in Monroe County, Wisconsin. It was built in 2005, so it is 20 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 10,000 vehicles a day, projected to reach 12,000 by 2041. The structure is 262 ft (80 m) long and 108 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

CarriesSth 21
CrossesIH 94
Location0.2M E JCT Ush 12
RouteState Highway 21
Coordinates44.01875, -90.49779
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 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 rating82.8 US tons
Inventory rating30.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length262 ft (80 m)
Longest span129 ft (39.3 m)
Deck width108 ft (33 m)
Roadway width94 ft (28.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,000 (2021)
Projected traffic12,000 by 2041
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed2.5 mi (4 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sth 21 over IH 94 built?

It was built in 2005, making it 20 years old in 2025.

What condition is Sth 21 over IH 94 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 October 2024.

How much traffic does Sth 21 over IH 94 carry?

About 10,000 vehicles per day (2021 count).

How long is Sth 21 over IH 94?

The structure is 262 ft (80 m) long with a longest span of 129 ft (39.3 m) and a deck 108 ft wide.

Who owns Sth 21 over IH 94?

It is owned by the State Highway Agency.