US Bridges

Sth 11 over Markham Creek

Fair

Rock County, Wisconsin · 1.9M E JCT Cth H · Structure no. B53010300000000

Built
1970
55 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
41 ft
1 main span
Daily traffic
4,100
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 11 over Markham Creek is a concrete slab carrying Sth 11 over Markham Creek in Rock County, Wisconsin. It was built in 1970, so it is 55 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 4,100 vehicles a day, roughly 4% of them trucks, projected to reach 5,040 by 2042. The structure is 41 ft (12.6 m) long and 45 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSth 11
CrossesMarkham Creek
Location1.9M E JCT Cth H
RouteState Highway 11
CountyRock County
StateWisconsin
Coordinates42.67272, -89.11351
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating37.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length41 ft (12.6 m)
Longest span41 ft (12.5 m)
Deck width45 ft (13.7 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,100 (2022)
Projected traffic5,040 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 11 over Markham Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is Sth 11 over Markham Creek 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 11 over Markham Creek carry?

About 4,100 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Sth 11 over Markham Creek?

The structure is 41 ft (12.6 m) long with a longest span of 41 ft (12.5 m) and a deck 45 ft wide.

Who owns Sth 11 over Markham Creek?

It is owned by the State Highway Agency.