US Bridges

Mo 79 S over Quarry RD

Fair

Ralls County, Missouri · S 2 T 56 N R 4 W · Structure no. 1030

Built
1964
61 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
101 ft
3 main spans
Daily traffic
3,162
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 79 S over Quarry RD is a concrete continuous slab carrying Mo 79 S over Quarry RD in Ralls County, Missouri. It was built in 1964, so it is 61 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 3,162 vehicles a day, roughly 15% of them trucks, projected to reach 4,901 by 2044. The structure is 101 ft (30.8 m) long and 31 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

CarriesMo 79 S
CrossesQuarry RD
LocationS 2 T 56 N R 4 W
RouteState Highway 79
Coordinates39.66903, -91.31169
Functional classRural Minor Arterial

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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.5 US tons
Inventory rating33.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length101 ft (30.8 m)
Longest span36 ft (11 m)
Deck width31 ft (9.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,162 (2024)
Projected traffic4,901 by 2044
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed16.8 mi (27 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mo 79 S over Quarry RD built?

It was built in 1964, making it 61 years old in 2025.

What condition is Mo 79 S over Quarry RD 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 November 2024.

How much traffic does Mo 79 S over Quarry RD carry?

About 3,162 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is Mo 79 S over Quarry RD?

The structure is 101 ft (30.8 m) long with a longest span of 36 ft (11 m) and a deck 31 ft wide.

Who owns Mo 79 S over Quarry RD?

It is owned by the State Highway Agency.