US Bridges

SB I-35 over Bike Path

Fair

Story County, Iowa · 1.1 Mi. N of Jct. Ia 210 · Structure no. 000000000049130

Built
1964
61 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
145 ft
3 main spans
Daily traffic
23,300
2022 count
Owner
State
State Highway Agency

About this bridge

SB I-35 over Bike Path is a prestressed concrete stringer/multi-beam or girder carrying SB I-35 over Bike Path 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 5 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 23,300 vehicles a day, roughly 19% of them trucks, projected to reach 23,300 by 2043. The structure is 145 ft (44.2 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSB I-35
CrossesBike Path
Location1.1 Mi. N of Jct. Ia 210
RouteInterstate 35
StateIowa
Coordinates41.89374, -93.57122
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating65.1 US tons
Inventory rating38.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length145 ft (44.2 m)
Longest span48 ft (14.6 m)
Deck width46 ft (14 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,300 (2022)
Projected traffic23,300 by 2043
Trucks19%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesPedestrian / bicycle
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 SB I-35 over Bike Path built?

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

What condition is SB I-35 over Bike Path 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 SB I-35 over Bike Path carry?

About 23,300 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is SB I-35 over Bike Path?

The structure is 145 ft (44.2 m) long with a longest span of 48 ft (14.6 m) and a deck 46 ft wide.

Who owns SB I-35 over Bike Path?

It is owned by the State Highway Agency.