US Bridges

Sth 26 SB over Lrd Blackhawk Island Roa

Good

Jefferson County, Wisconsin · 1.6M S JCT Sth 106 · Structure no. B28013300000000

Built
2011
14 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
912 ft
7 main spans
Daily traffic
7,000
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 26 SB over Lrd Blackhawk Island Roa is a prestressed concrete continuous stringer/multi-beam or girder carrying Sth 26 SB over Lrd Blackhawk Island Roa in Jefferson County, Wisconsin. It was built in 2011, so it is 14 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 7,000 vehicles a day, projected to reach 8,400 by 2042. The structure is 912 ft (278.1 m) long and 43 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSth 26 SB
CrossesLrd Blackhawk Island Roa
Location1.6M S JCT Sth 106
RouteState Highway 26
CountyJefferson County
StateWisconsin
Coordinates42.90098, -88.87742
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.3 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHL 93
Structure length912 ft (278.1 m)
Longest span130 ft (39.6 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,000 (2022)
Projected traffic8,400 by 2042
Trucks0%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed3.7 mi (6 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$5.3 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Sth 26 SB over Lrd Blackhawk Island Roa built?

It was built in 2011, making it 14 years old in 2025.

What condition is Sth 26 SB over Lrd Blackhawk Island Roa 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 June 2023.

How much traffic does Sth 26 SB over Lrd Blackhawk Island Roa carry?

About 7,000 vehicles per day (2022 count).

How long is Sth 26 SB over Lrd Blackhawk Island Roa?

The structure is 912 ft (278.1 m) long with a longest span of 130 ft (39.6 m) and a deck 43 ft wide.

Who owns Sth 26 SB over Lrd Blackhawk Island Roa?

It is owned by the State Highway Agency.