US Bridges

290th ST over I-35

Fair

Story County, Iowa · 4.0 Miles N of JCT Ia 210 · Structure no. 000000000049160

Built
1964
61 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
217 ft
4 main spans
Daily traffic
139
2022 count
Owner
State
State Highway Agency

About this bridge

290th ST over I-35 is a prestressed concrete stringer/multi-beam or girder carrying 290th ST over I-35 in Story County, Iowa. It was built in 1964, so it is 61 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 139 vehicles a day, roughly 25% of them trucks, projected to reach 139 by 2044. The structure is 217 ft (66.1 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries290th ST
CrossesI-35
Location4.0 Miles N of JCT Ia 210
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates41.93589, -93.57019
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating51.6 US tons
Inventory rating16.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length217 ft (66.1 m)
Longest span65 ft (19.8 m)
Deck width31 ft (9.3 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic139 (2022)
Projected traffic139 by 2044
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 290th ST over I-35 built?

It was built in 1964, making it 61 years old in 2025.

What condition is 290th ST 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 December 2024.

How much traffic does 290th ST over I-35 carry?

About 139 vehicles per day (2022 count), of which roughly 25% are trucks.

How long is 290th ST over I-35?

The structure is 217 ft (66.1 m) long with a longest span of 65 ft (19.8 m) and a deck 31 ft wide.

Who owns 290th ST over I-35?

It is owned by the State Highway Agency.