US Bridges

NB US 61 over I 80

Fair

Scott County, Iowa · At Jct. I-80 · Structure no. 000000000046960

Built
1963
62 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
251 ft
4 main spans
Daily traffic
1,990
2023 count
Owner
State
State Highway Agency

About this bridge

NB US 61 over I 80 is a prestressed concrete stringer/multi-beam or girder carrying NB US 61 over I 80 in Scott County, Iowa. It was built in 1963, so it is 62 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 5 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 1,990 vehicles a day, roughly 28% of them trucks, projected to reach 1,990 by 2043. The structure is 251 ft (76.5 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNB US 61
CrossesI 80
LocationAt Jct. I-80
RouteU.S. Route 61
CountyScott County
StateIowa
Coordinates41.59581, -90.57003
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating90.4 US tons
Inventory rating30.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length251 ft (76.5 m)
Longest span77 ft (23.5 m)
Deck width46 ft (13.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,990 (2023)
Projected traffic1,990 by 2043
Trucks28%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NB US 61 over I 80 built?

It was built in 1963, making it 62 years old in 2025.

What condition is NB US 61 over I 80 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 2024.

How much traffic does NB US 61 over I 80 carry?

About 1,990 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is NB US 61 over I 80?

The structure is 251 ft (76.5 m) long with a longest span of 77 ft (23.5 m) and a deck 46 ft wide.

Who owns NB US 61 over I 80?

It is owned by the State Highway Agency.