US Bridges

30th ST over Rock CR

Good

Jackson County, Missouri · S 15 T 49 N R 32 W · Structure no. 19171

Built
1985
40 years old
Condition
Good
inspected February 2023
Type
Slab
Concrete Continuous
Length
32 ft
3 main spans
Daily traffic
110
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

30th ST over Rock CR is a concrete continuous slab carrying 30th ST over Rock CR in Jackson County, Missouri. It was built in 1985, so it is 40 years old, younger than the Missouri average of 45.1 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 110 vehicles a day, roughly 2% of them trucks, projected to reach 143 by 2044. The structure is 32 ft (9.8 m) long and 39 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
Carries30th ST
CrossesRock CR
LocationS 15 T 49 N R 32 W
RouteCity Street 0
CountyJackson County
StateMissouri
Coordinates39.06708, -94.43758
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadOther
Structure length32 ft (9.8 m)
Longest span10 ft (3 m)
Deck width39 ft (12 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2024)
Projected traffic143 by 2044
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 30th ST over Rock CR built?

It was built in 1985, making it 40 years old in 2025.

What condition is 30th ST over Rock CR 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 February 2023.

How much traffic does 30th ST over Rock CR carry?

About 110 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is 30th ST over Rock CR?

The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m) and a deck 39 ft wide.

Who owns 30th ST over Rock CR?

It is owned by the City or Municipal Highway Agency.