US Bridges

Clay Street over I-35

Good

Clarke County, Iowa · 1.0 Mi. N of US 34 · Structure no. 000000000608260

Built
1999
26 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
260 ft
2 main spans
Daily traffic
1,911
2022 count
Owner
State
State Highway Agency

About this bridge

Clay Street over I-35 is a prestressed concrete stringer/multi-beam or girder carrying Clay Street over I-35 in Clarke County, Iowa. It was built in 1999, so it is 26 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 1,911 vehicles a day, roughly 20% of them trucks, projected to reach 1,911 by 2044. The structure is 260 ft (79.2 m) long and 49 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesClay Street
CrossesI-35
Location1.0 Mi. N of US 34
RouteCity Street 0
StateIowa
Coordinates41.04153, -93.79127
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating90.7 US tons
Inventory rating47.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length260 ft (79.2 m)
Longest span135 ft (41.1 m)
Deck width49 ft (15 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,911 (2022)
Projected traffic1,911 by 2044
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.9 mi (3 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 Clay Street over I-35 built?

It was built in 1999, making it 26 years old in 2025.

What condition is Clay Street 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 May 2024.

How much traffic does Clay Street over I-35 carry?

About 1,911 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is Clay Street over I-35?

The structure is 260 ft (79.2 m) long with a longest span of 135 ft (41.1 m) and a deck 49 ft wide.

Who owns Clay Street over I-35?

It is owned by the State Highway Agency.