US Bridges

I 80 EB over Iowa 21

Fair

Poweshiek County, Iowa · At Jct. Iowa 21 · Structure no. 000000000046210

Built
1963
62 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
137 ft
3 main spans
Daily traffic
13,550
2023 count
Owner
State
State Highway Agency

About this bridge

I 80 EB over Iowa 21 is a prestressed concrete stringer/multi-beam or girder carrying I 80 EB over Iowa 21 in Poweshiek 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 13,550 vehicles a day, roughly 37% of them trucks, projected to reach 13,550 by 2043. The structure is 137 ft (41.8 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 80 EB
CrossesIowa 21
LocationAt Jct. Iowa 21
RouteInterstate 80
CountyPoweshiek County
StateIowa
Coordinates41.69551, -92.35811
Functional classRural 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment7: Better than present minimum criteria
Operating rating69.9 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length137 ft (41.8 m)
Longest span56 ft (17.1 m)
Deck width49 ft (15 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,550 (2023)
Projected traffic13,550 by 2043
Trucks37%
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
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 I 80 EB over Iowa 21 built?

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

What condition is I 80 EB over Iowa 21 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 I 80 EB over Iowa 21 carry?

About 13,550 vehicles per day (2023 count), of which roughly 37% are trucks.

How long is I 80 EB over Iowa 21?

The structure is 137 ft (41.8 m) long with a longest span of 56 ft (17.1 m) and a deck 49 ft wide.

Who owns I 80 EB over Iowa 21?

It is owned by the State Highway Agency.