US Bridges

E-24 (160th St) over I-29

Fair

Monona County, Iowa · At Jct. of S.R. E24 · Structure no. 000000000037330

Built
1959
66 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
238 ft
4 main spans
Daily traffic
788
2022 count
Owner
State
State Highway Agency

About this bridge

E-24 (160th St) over I-29 is a prestressed concrete stringer/multi-beam or girder carrying E-24 (160th St) over I-29 in Monona County, Iowa. It was built in 1959, so it is 66 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 788 vehicles a day, roughly 8% of them trucks, projected to reach 788 by 2042. The structure is 238 ft (72.5 m) long and 34 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesE-24 (160th St)
CrossesI-29
LocationAt Jct. of S.R. E24
RouteCounty Highway 0
CountyMonona County
StateIowa
Coordinates42.12782, -96.20472
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating76.6 US tons
Inventory rating30.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length238 ft (72.5 m)
Longest span69 ft (21 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic788 (2022)
Projected traffic788 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed5 mi (8 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 E-24 (160th St) over I-29 built?

It was built in 1959, making it 66 years old in 2025.

What condition is E-24 (160th St) over I-29 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 May 2023.

How much traffic does E-24 (160th St) over I-29 carry?

About 788 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is E-24 (160th St) over I-29?

The structure is 238 ft (72.5 m) long with a longest span of 69 ft (21 m) and a deck 34 ft wide.

Who owns E-24 (160th St) over I-29?

It is owned by the State Highway Agency.