US Bridges

US 18 over Stewart Creek

Good

Floyd County, Iowa · 3.0 Mi. W of W JCT US 218 · Structure no. 000000000024931

Built
1998
27 years old
Condition
Good
inspected September 2023
Type
Culvert
Concrete Continuous
Length
40 ft
3 main spans
Daily traffic
11,200
2022 count
Owner
State
State Highway Agency

About this bridge

US 18 over Stewart Creek is a concrete continuous culvert carrying US 18 over Stewart Creek in Floyd County, Iowa. It was built in 1998, so it is 27 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 11,200 vehicles a day, roughly 24% of them trucks, projected to reach 11,200 by 2043. The structure is 40 ft (12.2 m) long. If it were closed, the detour would be 5 mi (8 km).

CarriesUS 18
CrossesStewart Creek
Location3.0 Mi. W of W JCT US 218
RouteU.S. Route 18
StateIowa
Coordinates43.12694, -92.79537
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.6 US tons
Inventory rating32.2 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,200 (2022)
Projected traffic11,200 by 2043
Trucks24%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 18 over Stewart Creek built?

It was built in 1998, making it 27 years old in 2025.

What condition is US 18 over Stewart Creek 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 2023.

How much traffic does US 18 over Stewart Creek carry?

About 11,200 vehicles per day (2022 count), of which roughly 24% are trucks.

How long is US 18 over Stewart Creek?

The structure is 40 ft (12.2 m) long with a longest span of 12 ft (3.7 m).

Who owns US 18 over Stewart Creek?

It is owned by the State Highway Agency.