US Bridges

NW Dillon DR over Mill CR

PoorPosted for load

Caldwell County, Missouri · S 5 T 56 N R 28 W · Structure no. 22609

Built
1930
95 years old
Condition
Poor
inspected December 2024
Type
Truss - Thru
Steel
Length
58 ft
1 main span
Daily traffic
35
2024 count
Owner
County
County Highway Agency

About this bridge

NW Dillon DR over Mill CR is a steel truss - thru carrying NW Dillon DR over Mill CR in Caldwell County, Missouri. It was built in 1930, so it is 95 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 35 vehicles a day, roughly 10% of them trucks, projected to reach 40 by 2044. The structure is 58 ft (17.7 m) long and 14 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesNW Dillon DR
CrossesMill CR
LocationS 5 T 56 N R 28 W
RouteCounty Highway 364
Coordinates39.68416, -94.06185
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26.8 US tons
Inventory rating15.9 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+1 approach)
Design loadOther
Structure length58 ft (17.7 m)
Longest span50 ft (15.2 m)
Deck width14 ft (4.3 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2024)
Projected traffic40 by 2044
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$455,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was NW Dillon DR over Mill CR built?

It was built in 1930, making it 95 years old in 2025.

What condition is NW Dillon DR over Mill CR in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2024.

How much traffic does NW Dillon DR over Mill CR carry?

About 35 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is NW Dillon DR over Mill CR?

The structure is 58 ft (17.7 m) long with a longest span of 50 ft (15.2 m) and a deck 14 ft wide.

Who owns NW Dillon DR over Mill CR?

It is owned by the County Highway Agency.