US Bridges

County RD 329 over North Rvr

Fair

Marion County, Missouri · S 14 T 58 N R 6 W · Structure no. 17675

Built
1991
34 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
243 ft
3 main spans
Daily traffic
400
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 329 over North Rvr is a prestressed concrete continuous stringer/multi-beam or girder carrying County RD 329 over North Rvr in Marion County, Missouri. It was built in 1991, so it is 34 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 400 vehicles a day, roughly 10% of them trucks, projected to reach 500 by 2043. The structure is 243 ft (74.1 m) long and 27 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesCounty RD 329
CrossesNorth Rvr
LocationS 14 T 58 N R 6 W
RouteCounty Highway 159
CountyMarion County
StateMissouri
Coordinates39.81703, -91.54592
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating64.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length243 ft (74.1 m)
Longest span90 ft (27.4 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2023)
Projected traffic500 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 329 over North Rvr built?

It was built in 1991, making it 34 years old in 2025.

What condition is County RD 329 over North Rvr 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 2023.

How much traffic does County RD 329 over North Rvr carry?

About 400 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD 329 over North Rvr?

The structure is 243 ft (74.1 m) long with a longest span of 90 ft (27.4 m) and a deck 27 ft wide.

Who owns County RD 329 over North Rvr?

It is owned by the County Highway Agency.