US Bridges

US 18 EB over I-35

Good

Cerro Gordo County, Iowa · At the Jct. of I-35 · Structure no. 000000000601970

Built
1998
27 years old
Condition
Good
inspected January 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
393 ft
4 main spans
Daily traffic
1,310
2022 count
Owner
State
State Highway Agency

About this bridge

US 18 EB over I-35 is a prestressed concrete stringer/multi-beam or girder carrying US 18 EB over I-35 in Cerro Gordo 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 1,310 vehicles a day, roughly 36% of them trucks, projected to reach 1,310 by 2043. The structure is 393 ft (119.8 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 18 EB
CrossesI-35
LocationAt the Jct. of I-35
RouteU.S. Route 18
StateIowa
Coordinates43.09877, -93.34638
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.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.2 US tons
Inventory rating41.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length393 ft (119.8 m)
Longest span101 ft (30.8 m)
Deck width41 ft (12.4 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,310 (2022)
Projected traffic1,310 by 2043
Trucks36%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
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 18 EB over I-35 built?

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

What condition is US 18 EB over I-35 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 January 2023.

How much traffic does US 18 EB over I-35 carry?

About 1,310 vehicles per day (2022 count), of which roughly 36% are trucks.

How long is US 18 EB over I-35?

The structure is 393 ft (119.8 m) long with a longest span of 101 ft (30.8 m) and a deck 41 ft wide.

Who owns US 18 EB over I-35?

It is owned by the State Highway Agency.