US Bridges

Sth 29 EB -Sth 73 over Black River

Fair

Clark County, Wisconsin · 0.8M E JCT Cth O · Structure no. B10001900000000

Built
1961
64 years old, rebuilt 1996
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
324 ft
3 main spans
Daily traffic
6,700
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 29 EB -Sth 73 over Black River is a steel continuous stringer/multi-beam or girder carrying Sth 29 EB -Sth 73 over Black River in Clark County, Wisconsin. It was built in 1961 and reconstructed in 1996, 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 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 6,700 vehicles a day, roughly 20% of them trucks, projected to reach 8,040 by 2039. The structure is 324 ft (98.8 m) long and 35 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSth 29 EB -Sth 73
CrossesBlack River
Location0.8M E JCT Cth O
RouteState Highway 29
CountyClark County
StateWisconsin
Coordinates44.94254, -90.6438
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating30.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length324 ft (98.8 m)
Longest span124 ft (37.8 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,700 (2022)
Projected traffic8,040 by 2039
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sth 29 EB -Sth 73 over Black River built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1996.

What condition is Sth 29 EB -Sth 73 over Black River 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 June 2023.

How much traffic does Sth 29 EB -Sth 73 over Black River carry?

About 6,700 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is Sth 29 EB -Sth 73 over Black River?

The structure is 324 ft (98.8 m) long with a longest span of 124 ft (37.8 m) and a deck 35 ft wide.

Who owns Sth 29 EB -Sth 73 over Black River?

It is owned by the State Highway Agency.