US Bridges

Byrnesville RD over Trib of Big Rvr

Fair

Jefferson County, Missouri · S 11 T 42 N R 3 E · Structure no. 29663

Built
2001
24 years old
Condition
Fair
inspected February 2025
Type
Frame
Concrete
Length
26 ft
1 main span
Daily traffic
1,652
2023 count
Owner
County
County Highway Agency

About this bridge

Byrnesville RD over Trib of Big Rvr is a concrete frame carrying Byrnesville RD over Trib of Big Rvr in Jefferson County, Missouri. It was built in 2001, so it is 24 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 1,652 vehicles a day, roughly 3% of them trucks, projected to reach 3,304 by 2043. The structure is 26 ft (7.9 m) long and 35 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesByrnesville RD
CrossesTrib of Big Rvr
LocationS 11 T 42 N R 3 E
RouteCounty Highway 0
CountyJefferson County
StateMissouri
Coordinates38.39142, -90.65114
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment6: Equal to present minimum criteria
Operating rating62.5 US tons
Inventory rating37.7 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span24 ft (7.3 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,652 (2023)
Projected traffic3,304 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Byrnesville RD over Trib of Big Rvr built?

It was built in 2001, making it 24 years old in 2025.

What condition is Byrnesville RD over Trib of Big Rvr 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 February 2025.

How much traffic does Byrnesville RD over Trib of Big Rvr carry?

About 1,652 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Byrnesville RD over Trib of Big Rvr?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.3 m) and a deck 35 ft wide.

Who owns Byrnesville RD over Trib of Big Rvr?

It is owned by the County Highway Agency.