US Bridges

1st Ave NB over I 80

Good

Johnson County, Iowa · 1st Ave NB over I-80 · Structure no. 000000000700141

Built
2023
2 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
205 ft
2 main spans
Daily traffic
9,000
2023 count
Owner
State
State Highway Agency

About this bridge

1st Ave NB over I 80 is a prestressed concrete stringer/multi-beam or girder carrying 1st Ave NB over I 80 in Johnson County, Iowa. It was built in 2023, so it is 2 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 9,000 vehicles a day, roughly 4% of them trucks, projected to reach 9,000 by 2044. The structure is 205 ft (62.5 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries1st Ave NB
CrossesI 80
Location1st Ave NB over I-80
RouteCity Street 0
CountyJohnson County
StateIowa
Coordinates41.68553, -91.56489
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length205 ft (62.5 m)
Longest span101 ft (30.8 m)
Deck width45 ft (13.8 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,000 (2023)
Projected traffic9,000 by 2044
Trucks4%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
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 1st Ave NB over I 80 built?

It was built in 2023, making it 2 years old in 2025.

What condition is 1st Ave NB over I 80 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does 1st Ave NB over I 80 carry?

About 9,000 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is 1st Ave NB over I 80?

The structure is 205 ft (62.5 m) long with a longest span of 101 ft (30.8 m) and a deck 45 ft wide.

Who owns 1st Ave NB over I 80?

It is owned by the State Highway Agency.