US Bridges

NB Ia 330 over US 30

Good

Marshall County, Iowa · At Junction With US 30 · Structure no. 000000000608735

Built
2001
24 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
275 ft
2 main spans
Daily traffic
3,050
2022 count
Owner
State
State Highway Agency

About this bridge

NB Ia 330 over US 30 is a prestressed concrete stringer/multi-beam or girder carrying NB Ia 330 over US 30 in Marshall County, Iowa. It was built in 2001, so it is 24 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 3,050 vehicles a day, roughly 13% of them trucks, projected to reach 3,050 by 2044. The structure is 275 ft (83.8 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNB Ia 330
CrossesUS 30
LocationAt Junction With US 30
RouteState Highway 330
CountyMarshall County
StateIowa
Coordinates42.00785, -93.02034
Functional classRural Principal Arterial - Other

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating94 US tons
Inventory rating52.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length275 ft (83.8 m)
Longest span140 ft (42.7 m)
Deck width43 ft (13 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,050 (2022)
Projected traffic3,050 by 2044
Trucks13%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 NB Ia 330 over US 30 built?

It was built in 2001, making it 24 years old in 2025.

What condition is NB Ia 330 over US 30 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 April 2024.

How much traffic does NB Ia 330 over US 30 carry?

About 3,050 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is NB Ia 330 over US 30?

The structure is 275 ft (83.8 m) long with a longest span of 140 ft (42.7 m) and a deck 43 ft wide.

Who owns NB Ia 330 over US 30?

It is owned by the State Highway Agency.