US Bridges

US 6 over North Raccoon River

Fair

Dallas County, Iowa · 0.3 Mi. E of E JCT US 169 · Structure no. 000000000021811

Built
1977
48 years old, rebuilt 1999
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
477 ft
5 main spans
Daily traffic
9,400
2022 count
Owner
State
State Highway Agency

About this bridge

US 6 over North Raccoon River is a prestressed concrete stringer/multi-beam or girder carrying US 6 over North Raccoon River in Dallas County, Iowa. It was built in 1977 and reconstructed in 1999, so it is 48 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 9,400 vehicles a day, roughly 7% of them trucks, projected to reach 9,400 by 2042. The structure is 477 ft (145.4 m) long and 58 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesUS 6
CrossesNorth Raccoon River
Location0.3 Mi. E of E JCT US 169
RouteU.S. Route 6
CountyDallas County
StateIowa
Coordinates41.61442, -94.01275
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating90.7 US tons
Inventory rating54.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length477 ft (145.4 m)
Longest span96 ft (29.3 m)
Deck width58 ft (17.7 m)
Roadway width55 ft (16.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,400 (2022)
Projected traffic9,400 by 2042
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 6 over North Raccoon River built?

It was built in 1977, making it 48 years old in 2025. It was reconstructed in 1999.

What condition is US 6 over North Raccoon River 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 May 2023.

How much traffic does US 6 over North Raccoon River carry?

About 9,400 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is US 6 over North Raccoon River?

The structure is 477 ft (145.4 m) long with a longest span of 96 ft (29.3 m) and a deck 58 ft wide.

Who owns US 6 over North Raccoon River?

It is owned by the State Highway Agency.