US Bridges

Hencken RD over Hollow Trib

Fair

St. Louis County, Missouri · S 20 T 44 N R 3 E · Structure no. 35210

Built
1998
27 years old
Condition
Fair
inspected January 2024
Type
Culvert
Concrete
Length
22 ft
1 main span
Daily traffic
120
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Hencken RD over Hollow Trib is a concrete culvert carrying Hencken RD over Hollow Trib in St. Louis County, Missouri. It was built in 1998, so it is 27 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 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 120 vehicles a day, roughly 10% of them trucks, projected to reach 192 by 2043. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 4.3 mi (7 km).

Location

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CarriesHencken RD
CrossesHollow Trib
LocationS 20 T 44 N R 3 E
RouteCity Street 0
CountySt. Louis County
StateMissouri
Coordinates38.54586, -90.69836
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26.8 US tons
Inventory rating15.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120 (2023)
Projected traffic192 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed4.3 mi (7 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Hencken RD over Hollow Trib built?

It was built in 1998, making it 27 years old in 2025.

What condition is Hencken RD over Hollow Trib 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 January 2024.

How much traffic does Hencken RD over Hollow Trib carry?

About 120 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Hencken RD over Hollow Trib?

The structure is 22 ft (6.7 m) long with a longest span of 14 ft (4.3 m).

Who owns Hencken RD over Hollow Trib?

It is owned by the City or Municipal Highway Agency.