US Bridges

US 6 & 71 & Ia 83 over Over Iais RR

Fair

Cass County, Iowa · 1.2 Mi. E of W Jct. US 71 · Structure no. 000000000017441

Built
1979
46 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
222 ft
3 main spans
Daily traffic
4,620
2022 count
Owner
State
State Highway Agency

About this bridge

US 6 & 71 & Ia 83 over Over Iais RR is a prestressed concrete stringer/multi-beam or girder carrying US 6 & 71 & Ia 83 over Over Iais RR in Cass County, Iowa. It was built in 1979, so it is 46 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 4,620 vehicles a day, roughly 12% of them trucks, projected to reach 4,620 by 2042. The structure is 222 ft (67.7 m) long and 47 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesUS 6 & 71 & Ia 83
CrossesOver Iais RR
Location1.2 Mi. E of W Jct. US 71
RouteU.S. Route 6
StateIowa
Coordinates41.40374, -94.9609
Functional classRural Principal Arterial - Other

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.1 US tons
Inventory rating37.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length222 ft (67.7 m)
Longest span82 ft (25 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,620 (2022)
Projected traffic4,620 by 2042
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 US 6 & 71 & Ia 83 over Over Iais RR built?

It was built in 1979, making it 46 years old in 2025.

What condition is US 6 & 71 & Ia 83 over Over Iais RR 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 January 2024.

How much traffic does US 6 & 71 & Ia 83 over Over Iais RR carry?

About 4,620 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is US 6 & 71 & Ia 83 over Over Iais RR?

The structure is 222 ft (67.7 m) long with a longest span of 82 ft (25 m) and a deck 47 ft wide.

Who owns US 6 & 71 & Ia 83 over Over Iais RR?

It is owned by the State Highway Agency.