US Bridges

Harness RD over Trib Hocum Hollow

Good

Jefferson County, Missouri · S 1258 T 39 N R 6 E · Structure no. 36805

Built
2022
3 years old
Condition
Good
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
70 ft
1 main span
Daily traffic
400
2023 count
Owner
County
County Highway Agency

About this bridge

Harness RD over Trib Hocum Hollow is a prestressed concrete stringer/multi-beam or girder carrying Harness RD over Trib Hocum Hollow in Jefferson County, Missouri. It was built in 2022, so it is 3 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 400 vehicles a day, roughly 5% of them trucks, projected to reach 800 by 2043. The structure is 70 ft (21.3 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesHarness RD
CrossesTrib Hocum Hollow
LocationS 1258 T 39 N R 6 E
RouteCounty Highway 340
CountyJefferson County
StateMissouri
Coordinates38.12656, -90.37124
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure9 ExcellentNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating65.5 US tons
Inventory rating50.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span68 ft (20.7 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2023)
Projected traffic800 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Harness RD over Trib Hocum Hollow built?

It was built in 2022, making it 3 years old in 2025.

What condition is Harness RD over Trib Hocum Hollow 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 Hocum Hollow carry?

About 400 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Harness RD over Trib Hocum Hollow?

The structure is 70 ft (21.3 m) long with a longest span of 68 ft (20.7 m) and a deck 35 ft wide.

Who owns Harness RD over Trib Hocum Hollow?

It is owned by the County Highway Agency.