NB I-35 over Elk Creek

Fair

Worth County, Iowa · 7.3 Mi. N of Jct. Ia 9 · Structure no. 000000000600180

Built: 1972; 53 years old
Condition: Fair; inspected February 2024
Type: Slab; Concrete Continuous
Length: 128 ft; 3 main spans
Daily traffic: 9,950; 2023 count
Owner: State; State Highway Agency

About this bridge

NB I-35 over Elk Creek is a concrete continuous slab carrying NB I-35 over Elk Creek in Worth County, Iowa. It was built in 1972, so it is 53 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 9,950 vehicles a day, roughly 32% of them trucks, projected to reach 9,950 by 2043. The structure is 128 ft (39 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps

CarriesNB I-35

CrossesElk Creek

Location7.3 Mi. N of Jct. Ia 9

RouteInterstate 35

CountyWorth County

StateIowa

Coordinates43.38956, -93.34922

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.

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	7 Good	Some minor problems.
Channel and channel protection	7 Good	Some minor problems.

Last inspectionFebruary 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 adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating90.8 US tons

Inventory rating54.6 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20

Structure length128 ft (39 m)

Longest span49 ft (14.9 m)

Deck width43 ft (13.2 m)

Roadway width40 ft (12.2 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,950 (2023)

Projected traffic9,950 by 2043

Trucks32%

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 Elk Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is NB I-35 over Elk 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 February 2024.

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

About 9,950 vehicles per day (2023 count), of which roughly 32% are trucks.

How long is NB I-35 over Elk Creek?

The structure is 128 ft (39 m) long with a longest span of 49 ft (14.9 m) and a deck 43 ft wide.

Who owns NB I-35 over Elk Creek?

It is owned by the State Highway Agency.