US Bridges

430th over Little Cedar River

Fair

Mitchell County, Iowa · 099161503 · Structure no. 000000000248525

Built
1984
41 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
191 ft
3 main spans
Daily traffic
403
2022 count
Owner
County
County Highway Agency

About this bridge

430th over Little Cedar River is a prestressed concrete stringer/multi-beam or girder carrying 430th over Little Cedar River in Mitchell County, Iowa. It was built in 1984, so it is 41 years old, younger 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 403 vehicles a day, roughly 22% of them trucks, projected to reach 403 by 2043. The structure is 191 ft (58.2 m) long and 31 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
Carries430th
CrossesLittle Cedar River
Location099161503
RouteCounty Highway 0
CountyMitchell County
StateIowa
Coordinates43.38586, -92.72016
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating66 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length191 ft (58.2 m)
Longest span69 ft (21 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic403 (2022)
Projected traffic403 by 2043
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 430th over Little Cedar River built?

It was built in 1984, making it 41 years old in 2025.

What condition is 430th over Little Cedar 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 December 2023.

How much traffic does 430th over Little Cedar River carry?

About 403 vehicles per day (2022 count), of which roughly 22% are trucks.

How long is 430th over Little Cedar River?

The structure is 191 ft (58.2 m) long with a longest span of 69 ft (21 m) and a deck 31 ft wide.

Who owns 430th over Little Cedar River?

It is owned by the County Highway Agency.