US Bridges

CO RD NW 450 over Br S Fk Blackwater

Fair

Johnson County, Missouri · S 32 T 47 N R 28 W · Structure no. 13416

Built
1990
35 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
61
2023 count
Owner
County
County Highway Agency

About this bridge

CO RD NW 450 over Br S Fk Blackwater is a steel stringer/multi-beam or girder carrying CO RD NW 450 over Br S Fk Blackwater in Johnson County, Missouri. It was built in 1990, so it is 35 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 61 vehicles a day, roughly 10% of them trucks, projected to reach 98 by 2043. The structure is 40 ft (12.2 m) long and 23 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCO RD NW 450
CrossesBr S Fk Blackwater
LocationS 32 T 47 N R 28 W
RouteCounty Highway 38
CountyJohnson County
StateMissouri
Coordinates38.83805, -94.03881
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating36.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
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 width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic61 (2023)
Projected traffic98 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 NW 450 over Br S Fk Blackwater built?

It was built in 1990, making it 35 years old in 2025.

What condition is CO RD NW 450 over Br S Fk 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 NW 450 over Br S Fk Blackwater carry?

About 61 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is CO RD NW 450 over Br S Fk 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 NW 450 over Br S Fk Blackwater?

It is owned by the County Highway Agency.