US Bridges

US 30 over Missouri River

Fair

Harrison County, Iowa · At Nebraska State Line · Structure no. 000000000027321

Built
1991
34 years old
Condition
Fair
inspected October 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
1,983 ft
2 main spans
Daily traffic
4,410
2022 count
Owner
State
State Highway Agency

About this bridge

US 30 over Missouri River is a steel continuous girder and floorbeam system carrying US 30 over Missouri River in Harrison County, Iowa. It was built in 1991, so it is 34 years old, younger 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 4,410 vehicles a day, roughly 28% of them trucks, projected to reach 4,410 by 2043. The structure is 1,983 ft (604.4 m) long and 43 ft wide. If it were closed, the detour would be 34.8 mi (56 km).

Location

Open in Google Maps
CarriesUS 30
CrossesMissouri River
LocationAt Nebraska State Line
RouteU.S. Route 30
CountyHarrison County
StateIowa
Coordinates41.55111, -96.09577
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating67.5 US tons
Inventory rating40.5 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+15 approach)
Design loadHS 20
Structure length1,983 ft (604.4 m)
Longest span333 ft (101.5 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,410 (2022)
Projected traffic4,410 by 2043
Trucks28%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.8 mi (56 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 30 over Missouri River built?

It was built in 1991, making it 34 years old in 2025.

What condition is US 30 over Missouri River 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 US 30 over Missouri River carry?

About 4,410 vehicles per day (2022 count), of which roughly 28% are trucks.

How long is US 30 over Missouri River?

The structure is 1,983 ft (604.4 m) long with a longest span of 333 ft (101.5 m) and a deck 43 ft wide.

Who owns US 30 over Missouri River?

It is owned by the State Highway Agency.