US Bridges

260th RD over Rock CR

Fair

Saline County, Missouri · S 34 T 51 N R 20 W · Structure no. 18144

Built
1978
47 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete
Length
23 ft
2 main spans
Daily traffic
35
2024 count
Owner
County
County Highway Agency

About this bridge

260th RD over Rock CR is a concrete slab carrying 260th RD over Rock CR in Saline County, Missouri. It was built in 1978, so it is 47 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 35 vehicles a day, roughly 10% of them trucks, projected to reach 39 by 2044. The structure is 23 ft (7 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries260th RD
CrossesRock CR
LocationS 34 T 51 N R 20 W
RouteCounty Highway 174
CountySaline County
StateMissouri
Coordinates39.16473, -93.08183
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadOther
Structure length23 ft (7 m)
Longest span11 ft (3.4 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2024)
Projected traffic39 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 260th RD over Rock CR built?

It was built in 1978, making it 47 years old in 2025.

What condition is 260th RD over Rock CR 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 March 2024.

How much traffic does 260th RD over Rock CR carry?

About 35 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is 260th RD over Rock CR?

The structure is 23 ft (7 m) long with a longest span of 11 ft (3.4 m) and a deck 26 ft wide.

Who owns 260th RD over Rock CR?

It is owned by the County Highway Agency.