US Bridges

WB US 30 over S 6th Ave

Fair

Clinton County, Iowa · 1.5 Mi. E of E Jct. US 61 · Structure no. 000000000602802

Built
1970
55 years old
Condition
Fair
inspected December 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
176 ft
3 main spans
Daily traffic
3,650
2022 count
Owner
State
State Highway Agency

About this bridge

WB US 30 over S 6th Ave is a prestressed concrete stringer/multi-beam or girder carrying WB US 30 over S 6th Ave in Clinton County, Iowa. It was built in 1970, so it is 55 years old, older than the Iowa average of 45.5 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 3,650 vehicles a day, roughly 18% of them trucks, projected to reach 3,650 by 2042. The structure is 176 ft (53.6 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesWB US 30
CrossesS 6th Ave
Location1.5 Mi. E of E Jct. US 61
RouteU.S. Route 30
CountyClinton County
StateIowa
Coordinates41.80726, -90.53881
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.2 US tons
Inventory rating30.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length176 ft (53.6 m)
Longest span92 ft (28 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,650 (2022)
Projected traffic3,650 by 2042
Trucks18%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was WB US 30 over S 6th Ave built?

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

What condition is WB US 30 over S 6th Ave 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 December 2022.

How much traffic does WB US 30 over S 6th Ave carry?

About 3,650 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is WB US 30 over S 6th Ave?

The structure is 176 ft (53.6 m) long with a longest span of 92 ft (28 m) and a deck 43 ft wide.

Who owns WB US 30 over S 6th Ave?

It is owned by the State Highway Agency.