US Bridges

CO RD NW 450 over S Fk of Blackwater

Good

Johnson County, Missouri · S 31 T 47 N R 28 W · Structure no. 13412

Built
1992
33 years old
Condition
Good
inspected November 2024
Type
Culvert
Concrete
Length
36 ft
1 main span
Daily traffic
98
2023 count
Owner
County
County Highway Agency

About this bridge

CO RD NW 450 over S Fk of Blackwater is a concrete culvert carrying CO RD NW 450 over S Fk of Blackwater in Johnson County, Missouri. It was built in 1992, so it is 33 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 98 vehicles a day, roughly 10% of them trucks, projected to reach 157 by 2043. The structure is 36 ft (11 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCO RD NW 450
CrossesS Fk of Blackwater
LocationS 31 T 47 N R 28 W
RouteCounty Highway 38
CountyJohnson County
StateMissouri
Coordinates38.83828, -94.04342
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.5 US tons
Inventory rating37.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length36 ft (11 m)
Longest span35 ft (10.7 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic98 (2023)
Projected traffic157 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 S Fk of Blackwater built?

It was built in 1992, making it 33 years old in 2025.

What condition is CO RD NW 450 over S Fk of Blackwater in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.

How much traffic does CO RD NW 450 over S Fk of Blackwater carry?

About 98 vehicles per day (2023 count), of which roughly 10% are trucks.

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

The structure is 36 ft (11 m) long with a longest span of 35 ft (10.7 m) and a deck 30 ft wide.

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

It is owned by the County Highway Agency.