US Bridges

470th over Wapsipinicon River

Fair

Mitchell County, Iowa · 100153401 · Structure no. 000000000248831

Built
1984
41 years old
Condition
Fair
inspected December 2023
Type
Slab
Concrete Continuous
Length
116 ft
3 main spans
Daily traffic
295
2022 count
Owner
County
County Highway Agency

About this bridge

470th over Wapsipinicon River is a concrete continuous slab carrying 470th over Wapsipinicon 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 295 vehicles a day, roughly 21% of them trucks, projected to reach 295 by 2043. The structure is 116 ft (35.4 m) long and 33 ft wide. If it were closed, the detour would be 29.2 mi (47 km).

Location

Open in Google Maps
Carries470th
CrossesWapsipinicon River
Location100153401
RouteCounty Highway 0
CountyMitchell County
StateIowa
Coordinates43.44329, -92.61157
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 protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.2 US tons
Inventory rating32 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length116 ft (35.4 m)
Longest span44 ft (13.4 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic295 (2022)
Projected traffic295 by 2043
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.2 mi (47 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 470th over Wapsipinicon River built?

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

What condition is 470th over Wapsipinicon 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 470th over Wapsipinicon River carry?

About 295 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is 470th over Wapsipinicon River?

The structure is 116 ft (35.4 m) long with a longest span of 44 ft (13.4 m) and a deck 33 ft wide.

Who owns 470th over Wapsipinicon River?

It is owned by the County Highway Agency.