US Bridges

Sth 100 Sb-S 108th over IH 43 NB

Fair

Milwaukee County, Wisconsin · 0.2M S JCT Cth Y (d) · Structure no. B40030100000000

Built
1965
60 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete Continuous
Length
113 ft
3 main spans
Daily traffic
12,900
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 100 Sb-S 108th over IH 43 NB is a concrete continuous slab carrying Sth 100 Sb-S 108th over IH 43 NB in Milwaukee County, Wisconsin. It was built in 1965, so it is 60 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 12,900 vehicles a day, roughly 3% of them trucks, projected to reach 23,326 by 2043. The structure is 113 ft (34.4 m) long and 46 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSth 100 Sb-S 108th
CrossesIH 43 NB
Location0.2M S JCT Cth Y (d)
RouteState Highway 100
CountyMilwaukee County
StateWisconsin
Coordinates42.95575, -88.04821
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating25 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length113 ft (34.4 m)
Longest span47 ft (14.3 m)
Deck width46 ft (13.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,900 (2022)
Projected traffic23,326 by 2043
Trucks3%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed0.6 mi (1 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$933,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sth 100 Sb-S 108th over IH 43 NB built?

It was built in 1965, making it 60 years old in 2025.

What condition is Sth 100 Sb-S 108th over IH 43 NB 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 March 2024.

How much traffic does Sth 100 Sb-S 108th over IH 43 NB carry?

About 12,900 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Sth 100 Sb-S 108th over IH 43 NB?

The structure is 113 ft (34.4 m) long with a longest span of 47 ft (14.3 m) and a deck 46 ft wide.

Who owns Sth 100 Sb-S 108th over IH 43 NB?

It is owned by the State Highway Agency.