US Bridges

Is 29 N over Is 35

Fair

Clay County, Missouri · S 1 T 50 N R 33 W · Structure no. 6411

Built
1955
70 years old, rebuilt 2015
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
330 ft
5 main spans
Daily traffic
49,521
2024 count
Owner
State
State Highway Agency

About this bridge

Is 29 N over Is 35 is a steel continuous stringer/multi-beam or girder carrying Is 29 N over Is 35 in Clay County, Missouri. It was built in 1955 and reconstructed in 2015, so it is 70 years old, older than the Missouri average of 45.1 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 49,521 vehicles a day, roughly 12% of them trucks, projected to reach 89,138 by 2044. The structure is 330 ft (100.6 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesIs 29 N
CrossesIs 35
LocationS 1 T 50 N R 33 W
RouteInterstate 29
Coordinates39.16912, -94.55805
Functional classUrban Principal Arterial - Interstate

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.4 US tons
Inventory rating44.6 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length330 ft (100.6 m)
Longest span85 ft (25.9 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic49,521 (2024)
Projected traffic89,138 by 2044
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Is 29 N over Is 35 built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2015.

What condition is Is 29 N over Is 35 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 September 2024.

How much traffic does Is 29 N over Is 35 carry?

About 49,521 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is Is 29 N over Is 35?

The structure is 330 ft (100.6 m) long with a longest span of 85 ft (25.9 m) and a deck 43 ft wide.

Who owns Is 29 N over Is 35?

It is owned by the State Highway Agency.