US Bridges

US 30 over Stream

Fair

Linn County, Iowa · 2.5 Mi. W of Jct. Ia #1 · Structure no. 000000000607510

Built
1951
74 years old, rebuilt 1999
Condition
Fair
inspected May 2024
Type
Culvert
Concrete Continuous
Length
24 ft
2 main spans
Daily traffic
12,000
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 Linn County, Iowa. It was built in 1951 and reconstructed in 1999, so it is 74 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 12,000 vehicles a day, roughly 11% of them trucks, projected to reach 12,000 by 2042. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 30
CrossesStream
Location2.5 Mi. W of Jct. Ia #1
RouteU.S. Route 30
StateIowa
Coordinates41.91772, -91.47184
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27 US tons
Inventory rating20 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length24 ft (7.3 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,000 (2022)
Projected traffic12,000 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 30 over Stream built?

It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1999.

What condition is US 30 over Stream 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 US 30 over Stream carry?

About 12,000 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is US 30 over Stream?

The structure is 24 ft (7.3 m) long with a longest span of 10 ft (3 m).

Who owns US 30 over Stream?

It is owned by the State Highway Agency.