US Bridges

8th ST over US 34

Fair

Des Moines County, Iowa · 1.8 Mi. E of Jct. US 61 · Structure no. 000000000023630

Built
1971
54 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
221 ft
3 main spans
Daily traffic
1,846
2022 count
Owner
State
State Highway Agency

About this bridge

8th ST over US 34 is a prestressed concrete stringer/multi-beam or girder carrying 8th ST over US 34 in Des Moines County, Iowa. It was built in 1971, so it is 54 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 1,846 vehicles a day, projected to reach 1,846 by 2043. The structure is 221 ft (67.4 m) long and 51 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries8th ST
CrossesUS 34
Location1.8 Mi. E of Jct. US 61
RouteCity Street 0
CountyDes Moines County
StateIowa
Coordinates40.81494, -91.10714
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating91.4 US tons
Inventory rating36.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length221 ft (67.4 m)
Longest span96 ft (29.3 m)
Deck width51 ft (15.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,846 (2022)
Projected traffic1,846 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 8th ST over US 34 built?

It was built in 1971, making it 54 years old in 2025.

What condition is 8th 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 8th ST over US 34 carry?

About 1,846 vehicles per day (2022 count).

How long is 8th ST over US 34?

The structure is 221 ft (67.4 m) long with a longest span of 96 ft (29.3 m) and a deck 51 ft wide.

Who owns 8th ST over US 34?

It is owned by the State Highway Agency.