US Bridges

US 30 over Stream

Good

Harrison County, Iowa · 1.5 Mi. W of Ia 37 · Structure no. 000000000605810

Built
1924
101 years old, rebuilt 1987
Condition
Good
inspected December 2023
Type
Culvert
Concrete Continuous
Length
26 ft
3 main spans
Daily traffic
3,090
2022 count
Owner
State
State Highway Agency

About this bridge

US 30 over Stream is a concrete continuous culvert carrying US 30 over Stream in Harrison County, Iowa. It was built in 1924 and reconstructed in 1987, so it is 101 years old, older 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 3,090 vehicles a day, roughly 24% of them trucks, projected to reach 3,090 by 2043. The structure is 26 ft (7.8 m) long. If it were closed, the detour would be 23 mi (37 km).

CarriesUS 30
CrossesStream
Location1.5 Mi. W of Ia 37
RouteU.S. Route 30
StateIowa
Coordinates41.83867, -95.61664
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39 US tons
Inventory rating20 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length26 ft (7.8 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,090 (2022)
Projected traffic3,090 by 2043
Trucks24%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed23 mi (37 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 30 over Stream built?

It was built in 1924, making it 101 years old in 2025. It was reconstructed in 1987.

What condition is US 30 over Stream 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 December 2023.

How much traffic does US 30 over Stream carry?

About 3,090 vehicles per day (2022 count), of which roughly 24% are trucks.

How long is US 30 over Stream?

The structure is 26 ft (7.8 m) long with a longest span of 8 ft (2.4 m).

Who owns US 30 over Stream?

It is owned by the State Highway Agency.