US Bridges

CO RD 550 over S Fk of Blackwater

Fair

Johnson County, Missouri · S 30 T 47 N R 28 W · Structure no. 13568

Built
1925
100 years old
Condition
Fair
inspected November 2024
Type
Tee Beam
Concrete Continuous
Length
40 ft
1 main span
Daily traffic
110
2023 count
Owner
County
County Highway Agency

About this bridge

CO RD 550 over S Fk of Blackwater is a concrete continuous tee beam carrying CO RD 550 over S Fk of Blackwater in Johnson County, Missouri. It was built in 1925, 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 5 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 110 vehicles a day, roughly 10% of them trucks, projected to reach 176 by 2043. The structure is 40 ft (12.2 m) long and 23 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCO RD 550
CrossesS Fk of Blackwater
LocationS 30 T 47 N R 28 W
RouteCounty Highway 42
CountyJohnson County
StateMissouri
Coordinates38.85676, -94.05138
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length40 ft (12.2 m)
Longest span40 ft (12.2 m)
Deck width23 ft (7 m)
Roadway width21 ft (6.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2023)
Projected traffic176 by 2043
Trucks10%
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 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 CO RD 550 over S Fk of Blackwater built?

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

What condition is CO RD 550 over S Fk of Blackwater 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 2024.

How much traffic does CO RD 550 over S Fk of Blackwater carry?

About 110 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is CO RD 550 over S Fk of Blackwater?

The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m) and a deck 23 ft wide.

Who owns CO RD 550 over S Fk of Blackwater?

It is owned by the County Highway Agency.