US Bridges

500th over Wapsipinicon River

Good

Mitchell County, Iowa · 100151801 · Structure no. 000000000248781

Built
1977
48 years old
Condition
Good
inspected December 2023
Type
Slab
Concrete Continuous
Length
103 ft
3 main spans
Daily traffic
70
2022 count
Owner
County
County Highway Agency

About this bridge

500th over Wapsipinicon River is a concrete continuous slab carrying 500th over Wapsipinicon River in Mitchell County, Iowa. It was built in 1977, so it is 48 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 70 vehicles a day, projected to reach 70 by 2043. The structure is 103 ft (31.4 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Carries500th
CrossesWapsipinicon River
Location100151801
RouteCounty Highway 0
StateIowa
Coordinates43.48684, -92.65871
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
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
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating33 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length103 ft (31.4 m)
Longest span39 ft (11.9 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2022)
Projected traffic70 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 500th over Wapsipinicon River built?

It was built in 1977, making it 48 years old in 2025.

What condition is 500th over Wapsipinicon River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does 500th over Wapsipinicon River carry?

About 70 vehicles per day (2022 count).

How long is 500th over Wapsipinicon River?

The structure is 103 ft (31.4 m) long with a longest span of 39 ft (11.9 m) and a deck 32 ft wide.

Who owns 500th over Wapsipinicon River?

It is owned by the County Highway Agency.