US Bridges

4th ST over US 34

Fair

Des Moines County, Iowa · 2.1 Mi. E of Jct. U.S. 61 · Structure no. 000000000602945

Built
1970
55 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
206 ft
4 main spans
Daily traffic
1,391
2022 count
Owner
State
State Highway Agency

About this bridge

4th ST over US 34 is a prestressed concrete stringer/multi-beam or girder carrying 4th ST over US 34 in Des Moines 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 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 1,391 vehicles a day, projected to reach 1,391 by 2043. The structure is 206 ft (62.8 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries4th ST
CrossesUS 34
Location2.1 Mi. E of Jct. U.S. 61
RouteCity Street 0
CountyDes Moines County
StateIowa
Coordinates40.81382, -91.1026
Functional classUrban Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
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 geometry7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating75.8 US tons
Inventory rating37.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length206 ft (62.8 m)
Longest span61 ft (18.6 m)
Deck width56 ft (17.1 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,391 (2022)
Projected traffic1,391 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 4th ST over US 34 built?

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

What condition is 4th ST over US 34 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 November 2023.

How much traffic does 4th ST over US 34 carry?

About 1,391 vehicles per day (2022 count).

How long is 4th ST over US 34?

The structure is 206 ft (62.8 m) long with a longest span of 61 ft (18.6 m) and a deck 56 ft wide.

Who owns 4th ST over US 34?

It is owned by the State Highway Agency.