US Bridges

Onyx Ave over Mid Fk Salt Rvr

Fair

Macon County, Missouri · S 26 T 56 N R 13 W · Structure no. 24598

Built
1987
38 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
119 ft
2 main spans
Daily traffic
100
2024 count
Owner
County
County Highway Agency

About this bridge

Onyx Ave over Mid Fk Salt Rvr is a prestressed concrete continuous stringer/multi-beam or girder carrying Onyx Ave over Mid Fk Salt Rvr in Macon County, Missouri. It was built in 1987, so it is 38 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 110 by 2044. The structure is 119 ft (36.3 m) long and 27 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesOnyx Ave
CrossesMid Fk Salt Rvr
LocationS 26 T 56 N R 13 W
RouteCounty Highway 516
CountyMacon County
StateMissouri
Coordinates39.62817, -92.32485
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadOther
Structure length119 ft (36.3 m)
Longest span65 ft (19.8 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2024)
Projected traffic110 by 2044
Trucks10%
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 Onyx Ave over Mid Fk Salt Rvr built?

It was built in 1987, making it 38 years old in 2025.

What condition is Onyx Ave over Mid Fk Salt 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 January 2024.

How much traffic does Onyx Ave over Mid Fk Salt Rvr carry?

About 100 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Onyx Ave over Mid Fk Salt Rvr?

The structure is 119 ft (36.3 m) long with a longest span of 65 ft (19.8 m) and a deck 27 ft wide.

Who owns Onyx Ave over Mid Fk Salt Rvr?

It is owned by the County Highway Agency.