US Bridges

US 6 over Raccoon River Overflow

Fair

Dallas County, Iowa · 0.6 Mi. E of E JCT US 169 · Structure no. 000000000021821

Built
1977
48 years old, rebuilt 1999
Condition
Fair
inspected October 2023
Type
Slab
Concrete Continuous
Length
138 ft
3 main spans
Daily traffic
9,400
2022 count
Owner
State
State Highway Agency

About this bridge

US 6 over Raccoon River Overflow is a concrete continuous slab carrying US 6 over Raccoon River Overflow 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 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 9,400 vehicles a day, roughly 7% of them trucks, projected to reach 9,400 by 2042. The structure is 138 ft (42.1 m) long and 70 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

CarriesUS 6
CrossesRaccoon River Overflow
Location0.6 Mi. E of E JCT US 169
RouteU.S. Route 6
StateIowa
Coordinates41.6145, -94.00581
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.1 US tons
Inventory rating28.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length138 ft (42.1 m)
Longest span53 ft (16.2 m)
Deck width70 ft (21.3 m)
Roadway width67 ft (20.4 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 closed11.2 mi (18 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 Raccoon River Overflow built?

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

What condition is US 6 over Raccoon River Overflow 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 October 2023.

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

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

How long is US 6 over Raccoon River Overflow?

The structure is 138 ft (42.1 m) long with a longest span of 53 ft (16.2 m) and a deck 70 ft wide.

Who owns US 6 over Raccoon River Overflow?

It is owned by the State Highway Agency.