US Bridges

US 6 over Four Mile Creek & Trail

Good

Polk County, Iowa · 1.3 Mi. E of Jct. I-235 · Structure no. 000000000040441

Built
2014
11 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
218 ft
3 main spans
Daily traffic
14,600
2022 count
Owner
State
State Highway Agency

About this bridge

US 6 over Four Mile Creek & Trail is a prestressed concrete stringer/multi-beam or girder carrying US 6 over Four Mile Creek & Trail in Polk County, Iowa. It was built in 2014, so it is 11 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 14,600 vehicles a day, roughly 3% of them trucks, projected to reach 14,600 by 2044. The structure is 218 ft (66.3 m) long and 81 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 6
CrossesFour Mile Creek & Trail
Location1.3 Mi. E of Jct. I-235
RouteU.S. Route 6
StateIowa
Coordinates41.62771, -93.5497
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length218 ft (66.3 m)
Longest span92 ft (28 m)
Deck width81 ft (24.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,600 (2022)
Projected traffic14,600 by 2044
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 Four Mile Creek & Trail built?

It was built in 2014, making it 11 years old in 2025.

What condition is US 6 over Four Mile Creek & Trail in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does US 6 over Four Mile Creek & Trail carry?

About 14,600 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is US 6 over Four Mile Creek & Trail?

The structure is 218 ft (66.3 m) long with a longest span of 92 ft (28 m) and a deck 81 ft wide.

Who owns US 6 over Four Mile Creek & Trail?

It is owned by the State Highway Agency.