US Bridges

Brownsmill RD 386 over Knox CR

Fair

Lincoln County, Missouri · S 25 T 51 N R 2 E · Structure no. 30672

Built
2004
21 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
76 ft
1 main span
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

Brownsmill RD 386 over Knox CR is a steel stringer/multi-beam or girder carrying Brownsmill RD 386 over Knox CR in Lincoln County, Missouri. It was built in 2004, so it is 21 years old, younger 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 5 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 50 vehicles a day, roughly 10% of them trucks, projected to reach 80 by 2043. The structure is 76 ft (23.2 m) long and 24 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesBrownsmill RD 386
CrossesKnox CR
LocationS 25 T 51 N R 2 E
RouteCounty Highway 64
CountyLincoln County
StateMissouri
Coordinates39.16544, -90.86272
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 alignment6: Equal to present minimum criteria
Operating rating86.3 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span74 ft (22.6 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic80 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 Brownsmill RD 386 over Knox CR built?

It was built in 2004, making it 21 years old in 2025.

What condition is Brownsmill RD 386 over Knox 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 May 2024.

How much traffic does Brownsmill RD 386 over Knox CR carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Brownsmill RD 386 over Knox CR?

The structure is 76 ft (23.2 m) long with a longest span of 74 ft (22.6 m) and a deck 24 ft wide.

Who owns Brownsmill RD 386 over Knox CR?

It is owned by the County Highway Agency.