US Bridges

SB I-380 over Cc RR

Fair

Linn County, Iowa · 2.6 Mi. S of JCT.100 · Structure no. 000000000604240

Built
1980
45 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
446 ft
5 main spans
Daily traffic
38,800
2022 count
Owner
State
State Highway Agency

About this bridge

SB I-380 over Cc RR is a steel continuous stringer/multi-beam or girder carrying SB I-380 over Cc RR in Linn County, Iowa. It was built in 1980, so it is 45 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 38,800 vehicles a day, roughly 11% of them trucks, projected to reach 38,800 by 2043. The structure is 446 ft (135.9 m) long and 72 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSB I-380
CrossesCc RR
Location2.6 Mi. S of JCT.100
RouteInterstate 380
CountyLinn County
StateIowa
Coordinates41.99314, -91.66494
Functional classUrban Principal Arterial - Interstate

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.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating55.7 US tons
Inventory rating35.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length446 ft (135.9 m)
Longest span100 ft (30.5 m)
Deck width72 ft (21.8 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,800 (2022)
Projected traffic38,800 by 2043
Trucks11%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 SB I-380 over Cc RR built?

It was built in 1980, making it 45 years old in 2025.

What condition is SB I-380 over Cc RR 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 February 2023.

How much traffic does SB I-380 over Cc RR carry?

About 38,800 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is SB I-380 over Cc RR?

The structure is 446 ft (135.9 m) long with a longest span of 100 ft (30.5 m) and a deck 72 ft wide.

Who owns SB I-380 over Cc RR?

It is owned by the State Highway Agency.