US Bridges

SE 6th ST over Des Moines River

Poor

Polk County, Iowa · 000000000 · Structure no. 000000000004090

Built
1976
49 years old, rebuilt 2010
Condition
Poor
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
830 ft
7 main spans
Daily traffic
7,911
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

SE 6th ST over Des Moines River is a steel continuous stringer/multi-beam or girder carrying SE 6th ST over Des Moines River in Polk County, Iowa. It was built in 1976 and reconstructed in 2010, so it is 49 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 7,911 vehicles a day, projected to reach 7,911 by 2043. The structure is 830 ft (253 m) long and 65 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSE 6th ST
CrossesDes Moines River
Location000000000
RouteCity Street 0
StateIowa
Coordinates41.57643, -93.60522
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating48.2 US tons
Inventory rating28 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length830 ft (253 m)
Longest span140 ft (42.7 m)
Deck width65 ft (19.9 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,911 (2022)
Projected traffic7,911 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$110,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SE 6th ST over Des Moines River built?

It was built in 1976, making it 49 years old in 2025. It was reconstructed in 2010.

What condition is SE 6th ST over Des Moines River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2023.

How much traffic does SE 6th ST over Des Moines River carry?

About 7,911 vehicles per day (2022 count).

How long is SE 6th ST over Des Moines River?

The structure is 830 ft (253 m) long with a longest span of 140 ft (42.7 m) and a deck 65 ft wide.

Who owns SE 6th ST over Des Moines River?

It is owned by the City or Municipal Highway Agency.