US Bridges

County RD 436 over Wyaconda Rvr

Good

Lewis County, Missouri · S 7 T 62 N R 6 W · Structure no. 31403

Built
2009
16 years old
Condition
Good
inspected February 2024
Type
Tee Beam
Prestressed Concrete Continuous
Length
180 ft
3 main spans
Daily traffic
40
2024 count
Owner
County
County Highway Agency

About this bridge

County RD 436 over Wyaconda Rvr is a prestressed concrete continuous tee beam carrying County RD 436 over Wyaconda Rvr in Lewis County, Missouri. It was built in 2009, so it is 16 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 40 vehicles a day, roughly 10% of them trucks, projected to reach 50 by 2044. The structure is 180 ft (54.9 m) long and 25 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesCounty RD 436
CrossesWyaconda Rvr
LocationS 7 T 62 N R 6 W
RouteCounty Highway 120
CountyLewis County
StateMissouri
Coordinates40.18497, -91.61069
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.5 US tons
Inventory rating38.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length180 ft (54.9 m)
Longest span60 ft (18.3 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2024)
Projected traffic50 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 436 over Wyaconda Rvr built?

It was built in 2009, making it 16 years old in 2025.

What condition is County RD 436 over Wyaconda Rvr 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 February 2024.

How much traffic does County RD 436 over Wyaconda Rvr carry?

About 40 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is County RD 436 over Wyaconda Rvr?

The structure is 180 ft (54.9 m) long with a longest span of 60 ft (18.3 m) and a deck 25 ft wide.

Who owns County RD 436 over Wyaconda Rvr?

It is owned by the County Highway Agency.