US Bridges

US 61 N over Waconda Rvr

Good

Lewis County, Missouri · S 14 T 61 N R 6 W · Structure no. 29111

Built
2001
24 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
285 ft
3 main spans
Daily traffic
7,505
2024 count
Owner
State
State Highway Agency

About this bridge

US 61 N over Waconda Rvr is a steel continuous stringer/multi-beam or girder carrying US 61 N over Waconda Rvr in Lewis County, Missouri. It was built in 2001, so it is 24 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 7,505 vehicles a day, roughly 33% of them trucks, projected to reach 14,260 by 2044. The structure is 285 ft (86.9 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 61 N
CrossesWaconda Rvr
LocationS 14 T 61 N R 6 W
RouteU.S. Route 61
Coordinates40.08431, -91.53562
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating66.5 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length285 ft (86.9 m)
Longest span112 ft (34 m)
Deck width40 ft (12.2 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,505 (2024)
Projected traffic14,260 by 2044
Trucks33%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US 61 N over Waconda Rvr built?

It was built in 2001, making it 24 years old in 2025.

What condition is US 61 N over Waconda 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 October 2024.

How much traffic does US 61 N over Waconda Rvr carry?

About 7,505 vehicles per day (2024 count), of which roughly 33% are trucks.

How long is US 61 N over Waconda Rvr?

The structure is 285 ft (86.9 m) long with a longest span of 112 ft (34 m) and a deck 40 ft wide.

Who owns US 61 N over Waconda Rvr?

It is owned by the State Highway Agency.