US Bridges

Harness RD over Trib of Plattin CR

Good

Jefferson County, Missouri · S 857 T 39 N R 6 E · Structure no. 22086

Built
2000
25 years old
Condition
Good
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
103 ft
1 main span
Daily traffic
300
2023 count
Owner
County
County Highway Agency

About this bridge

Harness RD over Trib of Plattin CR is a prestressed concrete stringer/multi-beam or girder carrying Harness RD over Trib of Plattin CR in Jefferson County, Missouri. It was built in 2000, so it is 25 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 300 vehicles a day, roughly 10% of them trucks, projected to reach 600 by 2043. The structure is 103 ft (31.4 m) long and 37 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesHarness RD
CrossesTrib of Plattin CR
LocationS 857 T 39 N R 6 E
RouteCounty Highway 340
CountyJefferson County
StateMissouri
Coordinates38.13107, -90.41088
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.3 US tons
Inventory rating36.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length103 ft (31.4 m)
Longest span100 ft (30.5 m)
Deck width37 ft (11.2 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2023)
Projected traffic600 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 Harness RD over Trib of Plattin CR built?

It was built in 2000, making it 25 years old in 2025.

What condition is Harness RD over Trib of Plattin 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 January 2025.

How much traffic does Harness RD over Trib of Plattin CR carry?

About 300 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Harness RD over Trib of Plattin CR?

The structure is 103 ft (31.4 m) long with a longest span of 100 ft (30.5 m) and a deck 37 ft wide.

Who owns Harness RD over Trib of Plattin CR?

It is owned by the County Highway Agency.