US Bridges

WB US 30 over Cedar River

Fair

Linn County, Iowa · 0.5 Mi. W of E JCT US 151 · Structure no. 000000000033472

Built
1975
50 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,141 ft
8 main spans
Daily traffic
11,750
2022 count
Owner
State
State Highway Agency

About this bridge

WB US 30 over Cedar River is a steel continuous stringer/multi-beam or girder carrying WB US 30 over Cedar River in Linn County, Iowa. It was built in 1975, so it is 50 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 11,750 vehicles a day, roughly 13% of them trucks, projected to reach 11,750 by 2044. The structure is 1,141 ft (347.8 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesWB US 30
CrossesCedar River
Location0.5 Mi. W of E JCT US 151
RouteU.S. Route 30
CountyLinn County
StateIowa
Coordinates41.92621, -91.54854
Functional classUrban Other Principal Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.2 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length1,141 ft (347.8 m)
Longest span150 ft (45.7 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,750 (2022)
Projected traffic11,750 by 2044
Trucks13%
Lanes on structure2
Traffic directionOne-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 WB US 30 over Cedar River built?

It was built in 1975, making it 50 years old in 2025.

What condition is WB US 30 over Cedar 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 August 2024.

How much traffic does WB US 30 over Cedar River carry?

About 11,750 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is WB US 30 over Cedar River?

The structure is 1,141 ft (347.8 m) long with a longest span of 150 ft (45.7 m) and a deck 44 ft wide.

Who owns WB US 30 over Cedar River?

It is owned by the State Highway Agency.