US Bridges

C Street over US 30

Fair

Linn County, Iowa · 1.6 Mi. E of Jct. I-380 · Structure no. 000000000600640

Built
1976
49 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
326 ft
4 main spans
Daily traffic
8,591
2022 count
Owner
State
State Highway Agency

About this bridge

C Street over US 30 is a steel continuous stringer/multi-beam or girder carrying C Street over US 30 in Linn County, Iowa. It was built in 1976, so it is 49 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 8,591 vehicles a day, roughly 8% of them trucks, projected to reach 8,591 by 2042. The structure is 326 ft (99.4 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesC Street
CrossesUS 30
Location1.6 Mi. E of Jct. I-380
RouteCity Street 0
CountyLinn County
StateIowa
Coordinates41.92621, -91.63741
Functional classUrban Minor 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 22 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length326 ft (99.4 m)
Longest span104 ft (31.7 m)
Deck width48 ft (14.5 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,591 (2022)
Projected traffic8,591 by 2042
Trucks8%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 C Street over US 30 built?

It was built in 1976, making it 49 years old in 2025.

What condition is C Street over US 30 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 April 2023.

How much traffic does C Street over US 30 carry?

About 8,591 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is C Street over US 30?

The structure is 326 ft (99.4 m) long with a longest span of 104 ft (31.7 m) and a deck 48 ft wide.

Who owns C Street over US 30?

It is owned by the State Highway Agency.