US Bridges

CO RD NW 450 over Br S Fk Blackwater

Fair

Johnson County, Missouri · S 35 T 47 N R 29 W · Structure no. 13063

Built
1900
125 years old, rebuilt 1987
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
3 main spans
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 1900 and reconstructed in 1987, so it is 125 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 61 vehicles a day, roughly 10% of them trucks, projected to reach 98 by 2043. The structure is 65 ft (19.8 m) long and 21 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCO RD NW 450
CrossesBr S Fk Blackwater
LocationS 35 T 47 N R 29 W
RouteCounty Highway 28
CountyJohnson County
StateMissouri
Coordinates38.83916, -94.08099
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating19.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length65 ft (19.8 m)
Longest span25 ft (7.6 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6.2 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 closed6.8 mi (11 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 1900, making it 125 years old in 2025. It was reconstructed in 1987.

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 65 ft (19.8 m) long with a longest span of 25 ft (7.6 m) and a deck 21 ft wide.

Who owns CO RD NW 450 over Br S Fk Blackwater?

It is owned by the County Highway Agency.