US Bridges

County RD NW 100 over Br S Fk Blackwater

Good

Johnson County, Missouri · S 18 T 46 N R 28 W · Structure no. 33521

Built
2010
15 years old
Condition
Good
inspected November 2024
Type
Channel Beam
Concrete
Length
33 ft
1 main span
Daily traffic
10
2023 count
Owner
County
County Highway Agency

About this bridge

County RD NW 100 over Br S Fk Blackwater is a concrete channel beam carrying County RD NW 100 over Br S Fk Blackwater in Johnson County, Missouri. It was built in 2010, so it is 15 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 10 vehicles a day, roughly 10% of them trucks, projected to reach 16 by 2043. The structure is 33 ft (10.1 m) long and 23 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCounty RD NW 100
CrossesBr S Fk Blackwater
LocationS 18 T 46 N R 28 W
RouteCounty Highway 275
CountyJohnson County
StateMissouri
Coordinates38.80121, -94.05557
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
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 above top of footing
Structural evaluation7: Better than present minimum criteria
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 rating67.5 US tons
Inventory rating40.7 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span30 ft (9.1 m)
Deck width23 ft (7.1 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2023)
Projected traffic16 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD NW 100 over Br S Fk Blackwater built?

It was built in 2010, making it 15 years old in 2025.

What condition is County RD NW 100 over Br S Fk 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 County RD NW 100 over Br S Fk Blackwater carry?

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

How long is County RD NW 100 over Br S Fk Blackwater?

The structure is 33 ft (10.1 m) long with a longest span of 30 ft (9.1 m) and a deck 23 ft wide.

Who owns County RD NW 100 over Br S Fk Blackwater?

It is owned by the County Highway Agency.