US Bridges

County RD NW 1100 over Blackjack CR

Fair

Johnson County, Missouri · S 27 T 48 N R 26 W · Structure no. 25739

Built
1900
125 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
38 ft
1 main span
Daily traffic
35
2023 count
Owner
County
County Highway Agency

About this bridge

County RD NW 1100 over Blackjack CR is a steel stringer/multi-beam or girder carrying County RD NW 1100 over Blackjack CR in Johnson County, Missouri. It was built in 1900, 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 35 vehicles a day, roughly 10% of them trucks, projected to reach 56 by 2043. The structure is 38 ft (11.6 m) long and 22 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCounty RD NW 1100
CrossesBlackjack CR
LocationS 27 T 48 N R 26 W
RouteCounty Highway 116
CountyJohnson County
StateMissouri
Coordinates38.92838, -93.77406
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
Deck7 GoodSome minor problems.
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 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.7 US tons
Inventory rating19.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length38 ft (11.6 m)
Longest span38 ft (11.6 m)
Deck width22 ft (6.6 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2023)
Projected traffic56 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 County RD NW 1100 over Blackjack CR built?

It was built in 1900, making it 125 years old in 2025.

What condition is County RD NW 1100 over Blackjack CR 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 County RD NW 1100 over Blackjack CR carry?

About 35 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD NW 1100 over Blackjack CR?

The structure is 38 ft (11.6 m) long with a longest span of 38 ft (11.6 m) and a deck 22 ft wide.

Who owns County RD NW 1100 over Blackjack CR?

It is owned by the County Highway Agency.