US Bridges

US 218 over US 30

Good

Benton County, Iowa · US 218/US 30 Interchange · Structure no. 000000000700855

Built
2017
8 years old
Condition
Good
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
260 ft
2 main spans
Daily traffic
1,310
2023 count
Owner
State
State Highway Agency

About this bridge

US 218 over US 30 is a prestressed concrete stringer/multi-beam or girder carrying US 218 over US 30 in Benton County, Iowa. It was built in 2017, so it is 8 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 1,310 vehicles a day, roughly 15% of them trucks, projected to reach 1,310 by 2044. The structure is 260 ft (79.2 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 218
CrossesUS 30
LocationUS 218/US 30 Interchange
RouteU.S. Route 218
StateIowa
Coordinates41.96383, -92.02772
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry8: Equal 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 spans2
Design loadHL 93
Structure length260 ft (79.2 m)
Longest span136 ft (41.5 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,310 (2023)
Projected traffic1,310 by 2044
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 218 over US 30 built?

It was built in 2017, making it 8 years old in 2025.

What condition is US 218 over US 30 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 December 2024.

How much traffic does US 218 over US 30 carry?

About 1,310 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is US 218 over US 30?

The structure is 260 ft (79.2 m) long with a longest span of 136 ft (41.5 m) and a deck 47 ft wide.

Who owns US 218 over US 30?

It is owned by the State Highway Agency.