US Bridges

Walnut ST S over Is 670

Fair

Jackson County, Missouri · S 5 T 49 N R 33 W · Structure no. 590

Built
1961
64 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
141 ft
2 main spans
Daily traffic
6,478
2024 count
Owner
State
State Highway Agency

About this bridge

Walnut ST S over Is 670 is a concrete continuous slab carrying Walnut ST S over Is 670 in Jackson County, Missouri. It was built in 1961, so it is 64 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 6,478 vehicles a day, roughly 10% of them trucks, projected to reach 9,069 by 2044. The structure is 141 ft (43 m) long and 54 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesWalnut ST S
CrossesIs 670
LocationS 5 T 49 N R 33 W
RouteCity Street 0
CountyJackson County
StateMissouri
Coordinates39.09612, -94.58226
Functional classUrban 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.4 US tons
Inventory rating48.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length141 ft (43 m)
Longest span68 ft (20.8 m)
Deck width54 ft (16.5 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,478 (2024)
Projected traffic9,069 by 2044
Trucks10%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Walnut ST S over Is 670 built?

It was built in 1961, making it 64 years old in 2025.

What condition is Walnut ST S over Is 670 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 2023.

How much traffic does Walnut ST S over Is 670 carry?

About 6,478 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Walnut ST S over Is 670?

The structure is 141 ft (43 m) long with a longest span of 68 ft (20.8 m) and a deck 54 ft wide.

Who owns Walnut ST S over Is 670?

It is owned by the State Highway Agency.