US Bridges

County RD 552 over Wyaconda Rvr

PoorClosed to traffic

Lewis County, Missouri · S 14 T 61 N R 6 W · Structure no. 19016

Built
1900
125 years old
Condition
Poor
inspected January 2020
Type
Truss - Thru
Steel
Length
112 ft
1 main span
Daily traffic
15
2024 count
Owner
County
County Highway Agency

About this bridge

County RD 552 over Wyaconda Rvr is a steel truss - thru carrying County RD 552 over Wyaconda Rvr in Lewis 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 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: closed to all traffic.

It carries about 15 vehicles a day, roughly 10% of them trucks, projected to reach 19 by 2044. The structure is 112 ft (34.1 m) long and 15 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

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CarriesCounty RD 552
CrossesWyaconda Rvr
LocationS 14 T 61 N R 6 W
RouteCounty Highway 207
CountyLewis County
StateMissouri
Coordinates40.08797, -91.53817
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionJanuary 2020
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadOther
Structure length112 ft (34.1 m)
Longest span110 ft (33.5 m)
Deck width15 ft (4.5 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic15 (2024)
Projected traffic19 by 2044
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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$782,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 552 over Wyaconda Rvr built?

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

What condition is County RD 552 over Wyaconda Rvr 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 January 2020.

How much traffic does County RD 552 over Wyaconda Rvr carry?

About 15 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is County RD 552 over Wyaconda Rvr?

The structure is 112 ft (34.1 m) long with a longest span of 110 ft (33.5 m) and a deck 15 ft wide.

Who owns County RD 552 over Wyaconda Rvr?

It is owned by the County Highway Agency.