US Bridges

Main ST over Iowa River

Fair

Hardin County, Iowa · 088192801 · Structure no. 000000000011160

Built
1936
89 years old, rebuilt 1999
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
162 ft
2 main spans
Daily traffic
387
2022 count
Owner
County
County Highway Agency

About this bridge

Main ST over Iowa River is a steel continuous stringer/multi-beam or girder carrying Main ST over Iowa River in Hardin County, Iowa. It was built in 1936 and reconstructed in 1999, so it is 89 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 387 vehicles a day, projected to reach 387 by 2044. The structure is 162 ft (49.4 m) long and 38 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesMain ST
CrossesIowa River
Location088192801
RouteCity Street 0
CountyHardin County
StateIowa
Coordinates42.40725, -93.07228
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54.7 US tons
Inventory rating32.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length162 ft (49.4 m)
Longest span81 ft (24.7 m)
Deck width38 ft (11.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic387 (2022)
Projected traffic387 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Main ST over Iowa River built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1999.

What condition is Main ST over Iowa River 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 February 2024.

How much traffic does Main ST over Iowa River carry?

About 387 vehicles per day (2022 count).

How long is Main ST over Iowa River?

The structure is 162 ft (49.4 m) long with a longest span of 81 ft (24.7 m) and a deck 38 ft wide.

Who owns Main ST over Iowa River?

It is owned by the County Highway Agency.