US Bridges

Rock CR Gardens RD over Rock CR

Good

Jefferson County, Missouri · S 34 T 43 N R 5 E · Structure no. 35972

Built
2018
7 years old
Condition
Good
inspected February 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
87 ft
1 main span
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

Rock CR Gardens RD over Rock CR is a prestressed concrete box beam or girders - multiple carrying Rock CR Gardens RD over Rock CR in Jefferson County, Missouri. It was built in 2018, so it is 7 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 50 vehicles a day, roughly 2% of them trucks, projected to reach 100 by 2043. The structure is 87 ft (26.5 m) long and 24 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesRock CR Gardens RD
CrossesRock CR
LocationS 34 T 43 N R 5 E
RouteCounty Highway 428
CountyJefferson County
StateMissouri
Coordinates38.41443, -90.45058
Functional classRural 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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.4 US tons
Inventory rating59.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length87 ft (26.5 m)
Longest span83 ft (25.3 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic100 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Rock CR Gardens RD over Rock CR built?

It was built in 2018, making it 7 years old in 2025.

What condition is Rock CR Gardens RD 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 2025.

How much traffic does Rock CR Gardens RD over Rock CR carry?

About 50 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Rock CR Gardens RD over Rock CR?

The structure is 87 ft (26.5 m) long with a longest span of 83 ft (25.3 m) and a deck 24 ft wide.

Who owns Rock CR Gardens RD over Rock CR?

It is owned by the County Highway Agency.