US Bridges

IH 90 Eb-Ih 94 EB over Mirror Lake

Fair

Sauk County, Wisconsin · 0.9M E JCT Sth 23 to E · Structure no. B56004700000000

Built
1961
64 years old, rebuilt 1990
Condition
Fair
inspected September 2024
Type
Frame
Steel Continuous
Length
325 ft
3 main spans
Daily traffic
23,500
2021 count
Owner
State
State Highway Agency

About this bridge

IH 90 Eb-Ih 94 EB over Mirror Lake is a steel continuous frame carrying IH 90 Eb-Ih 94 EB over Mirror Lake in Sauk County, Wisconsin. It was built in 1961 and reconstructed in 1990, so it is 64 years old, older 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 5 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 23,500 vehicles a day, roughly 13% of them trucks, projected to reach 28,200 by 2041. The structure is 325 ft (99.2 m) long and 34 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesIH 90 Eb-Ih 94 EB
CrossesMirror Lake
Location0.9M E JCT Sth 23 to E
RouteInterstate 90
CountySauk County
StateWisconsin
Coordinates43.57974, -89.80416
Functional classRural Principal Arterial - Interstate

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating41.1 US tons

Structure

Structure typeFrame
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length325 ft (99.2 m)
Longest span220 ft (67.1 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,500 (2021)
Projected traffic28,200 by 2041
Trucks13%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate 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 IH 90 Eb-Ih 94 EB over Mirror Lake built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1990.

What condition is IH 90 Eb-Ih 94 EB over Mirror Lake 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 2024.

How much traffic does IH 90 Eb-Ih 94 EB over Mirror Lake carry?

About 23,500 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is IH 90 Eb-Ih 94 EB over Mirror Lake?

The structure is 325 ft (99.2 m) long with a longest span of 220 ft (67.1 m) and a deck 34 ft wide.

Who owns IH 90 Eb-Ih 94 EB over Mirror Lake?

It is owned by the State Highway Agency.