US Bridges

County RD 420 over Sugar CR

Fair

Lewis County, Missouri · S 23 T 62 N R 7 W · Structure no. 15987

Built
1988
37 years old
Condition
Fair
inspected February 2024
Type
Tee Beam
Prestressed Concrete Continuous
Length
101 ft
3 main spans
Daily traffic
150
2024 count
Owner
County
County Highway Agency

About this bridge

County RD 420 over Sugar CR is a prestressed concrete continuous tee beam carrying County RD 420 over Sugar CR in Lewis County, Missouri. It was built in 1988, so it is 37 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 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 150 vehicles a day, roughly 10% of them trucks, projected to reach 188 by 2044. The structure is 101 ft (30.8 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCounty RD 420
CrossesSugar CR
LocationS 23 T 62 N R 7 W
RouteCounty Highway 105
CountyLewis County
StateMissouri
Coordinates40.16211, -91.63469
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment6: Equal to present minimum criteria
Operating rating54.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length101 ft (30.8 m)
Longest span40 ft (12.2 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2024)
Projected traffic188 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 420 over Sugar CR built?

It was built in 1988, making it 37 years old in 2025.

What condition is County RD 420 over Sugar 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 February 2024.

How much traffic does County RD 420 over Sugar CR carry?

About 150 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is County RD 420 over Sugar CR?

The structure is 101 ft (30.8 m) long with a longest span of 40 ft (12.2 m) and a deck 27 ft wide.

Who owns County RD 420 over Sugar CR?

It is owned by the County Highway Agency.