US Bridges

County RD 4006 over Rocky Br

Fair

Callaway County, Missouri · S 35 T 45 N R 10 W · Structure no. 19972

Built
1988
37 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
26 ft
1 main span
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 4006 over Rocky Br is a steel stringer/multi-beam or girder carrying County RD 4006 over Rocky Br in Callaway County, Missouri. It was built in 1988, so it is 37 years old, younger 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 5 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 50 vehicles a day, roughly 5% of them trucks, projected to reach 75 by 2043. The structure is 26 ft (7.9 m) long and 18 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCounty RD 4006
CrossesRocky Br
LocationS 35 T 45 N R 10 W
RouteCounty Highway 242
CountyCallaway County
StateMissouri
Coordinates38.62906, -92.0165
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40.7 US tons
Inventory rating24.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length26 ft (7.9 m)
Longest span26 ft (7.9 m)
Deck width18 ft (5.5 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2043
Trucks5%
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 County RD 4006 over Rocky Br built?

It was built in 1988, making it 37 years old in 2025.

What condition is County RD 4006 over Rocky Br 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 October 2024.

How much traffic does County RD 4006 over Rocky Br carry?

About 50 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is County RD 4006 over Rocky Br?

The structure is 26 ft (7.9 m) long with a longest span of 26 ft (7.9 m) and a deck 18 ft wide.

Who owns County RD 4006 over Rocky Br?

It is owned by the County Highway Agency.