US Bridges

SR E-18 over I-35

Fair

Story County, Iowa · At JCT I-35 and SR E18 · Structure no. 000000000049090

Built
1967
58 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
223 ft
4 main spans
Daily traffic
4,079
2022 count
Owner
State
State Highway Agency

About this bridge

SR E-18 over I-35 is a prestressed concrete stringer/multi-beam or girder carrying SR E-18 over I-35 in Story County, Iowa. It was built in 1967, so it is 58 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 4,079 vehicles a day, roughly 3% of them trucks, projected to reach 4,079 by 2043. The structure is 223 ft (68 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesSR E-18
CrossesI-35
LocationAt JCT I-35 and SR E18
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates42.16611, -93.57109
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating68.5 US tons
Inventory rating23 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length223 ft (68 m)
Longest span69 ft (21 m)
Deck width35 ft (10.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,079 (2022)
Projected traffic4,079 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed3.7 mi (6 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR E-18 over I-35 built?

It was built in 1967, making it 58 years old in 2025.

What condition is SR E-18 over I-35 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 SR E-18 over I-35 carry?

About 4,079 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is SR E-18 over I-35?

The structure is 223 ft (68 m) long with a longest span of 69 ft (21 m) and a deck 35 ft wide.

Who owns SR E-18 over I-35?

It is owned by the State Highway Agency.