US Bridges

NB I-380 over Cc RR & Ash Pit

Fair

Linn County, Iowa · 2.9 Mi. S of Jct. Ia 100 · Structure no. 000000000604210

Built
1979
46 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,763 ft
17 main spans
Daily traffic
32,300
2022 count
Owner
State
State Highway Agency

About this bridge

NB I-380 over Cc RR & Ash Pit is a steel continuous stringer/multi-beam or girder carrying NB I-380 over Cc RR & Ash Pit in Linn County, Iowa. It was built in 1979, so it is 46 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 32,300 vehicles a day, roughly 12% of them trucks, projected to reach 32,300 by 2043. The structure is 1,763 ft (537.4 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNB I-380
CrossesCc RR & Ash Pit
Location2.9 Mi. S of Jct. Ia 100
RouteInterstate 380
CountyLinn County
StateIowa
Coordinates41.9851, -91.66304
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating62.5 US tons
Inventory rating37.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans17
Design loadHS 20 + Mod
Structure length1,763 ft (537.4 m)
Longest span158 ft (48.2 m)
Deck width55 ft (16.9 m)
Roadway width52 ft (15.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,300 (2022)
Projected traffic32,300 by 2043
Trucks12%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad and waterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was NB I-380 over Cc RR & Ash Pit built?

It was built in 1979, making it 46 years old in 2025.

What condition is NB I-380 over Cc RR & Ash Pit 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 June 2023.

How much traffic does NB I-380 over Cc RR & Ash Pit carry?

About 32,300 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is NB I-380 over Cc RR & Ash Pit?

The structure is 1,763 ft (537.4 m) long with a longest span of 158 ft (48.2 m) and a deck 55 ft wide.

Who owns NB I-380 over Cc RR & Ash Pit?

It is owned by the State Highway Agency.