US Bridges

NB I-35 over White Breast Creek

Fair

Clarke County, Iowa · 1.3 Mi. S of Jct. US 34 · Structure no. 000000000020140

Built
1969
56 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
146 ft
3 main spans
Daily traffic
8,650
2022 count
Owner
State
State Highway Agency

About this bridge

NB I-35 over White Breast Creek is a prestressed concrete stringer/multi-beam or girder carrying NB I-35 over White Breast Creek in Clarke County, Iowa. It was built in 1969, so it is 56 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 8,650 vehicles a day, roughly 34% of them trucks, projected to reach 8,650 by 2044. The structure is 146 ft (44.5 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNB I-35
CrossesWhite Breast Creek
Location1.3 Mi. S of Jct. US 34
RouteInterstate 35
StateIowa
Coordinates41.00874, -93.79738
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.6 US tons
Inventory rating38.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length146 ft (44.5 m)
Longest span57 ft (17.4 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,650 (2022)
Projected traffic8,650 by 2044
Trucks34%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was NB I-35 over White Breast Creek built?

It was built in 1969, making it 56 years old in 2025.

What condition is NB I-35 over White Breast Creek 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 May 2024.

How much traffic does NB I-35 over White Breast Creek carry?

About 8,650 vehicles per day (2022 count), of which roughly 34% are trucks.

How long is NB I-35 over White Breast Creek?

The structure is 146 ft (44.5 m) long with a longest span of 57 ft (17.4 m) and a deck 44 ft wide.

Who owns NB I-35 over White Breast Creek?

It is owned by the State Highway Agency.