US Bridges

Mo 15 S over Coon CR

Fair

Knox County, Missouri · S 6 T 61 N R 11 W · Structure no. 4872

Built
1925
100 years old, rebuilt 1990
Condition
Fair
inspected November 2023
Type
Tee Beam
Concrete
Length
48 ft
1 main span
Daily traffic
1,025
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 15 S over Coon CR is a concrete tee beam carrying Mo 15 S over Coon CR in Knox County, Missouri. It was built in 1925 and reconstructed in 1990, so it is 100 years old, older 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 1,025 vehicles a day, roughly 22% of them trucks, projected to reach 1,589 by 2044. The structure is 48 ft (14.6 m) long and 23 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesMo 15 S
CrossesCoon CR
LocationS 6 T 61 N R 11 W
RouteState Highway 15
CountyKnox County
StateMissouri
Coordinates40.1126, -92.17459
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating57.5 US tons
Inventory rating29.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length48 ft (14.6 m)
Longest span45 ft (13.7 m)
Deck width23 ft (7 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,025 (2024)
Projected traffic1,589 by 2044
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$408,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mo 15 S over Coon CR built?

It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1990.

What condition is Mo 15 S over Coon CR 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 November 2023.

How much traffic does Mo 15 S over Coon CR carry?

About 1,025 vehicles per day (2024 count), of which roughly 22% are trucks.

How long is Mo 15 S over Coon CR?

The structure is 48 ft (14.6 m) long with a longest span of 45 ft (13.7 m) and a deck 23 ft wide.

Who owns Mo 15 S over Coon CR?

It is owned by the State Highway Agency.