US Bridges

County RD 629 over Lake Slu

Good

Butler County, Missouri · S 25 T 24 N R 7 E · Structure no. 15984

Built
1999
26 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
75 ft
1 main span
Daily traffic
100
2024 count
Owner
County
County Highway Agency

About this bridge

County RD 629 over Lake Slu is a prestressed concrete stringer/multi-beam or girder carrying County RD 629 over Lake Slu in Butler County, Missouri. It was built in 1999, so it is 26 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 100 vehicles a day, roughly 15% of them trucks, projected to reach 135 by 2044. The structure is 75 ft (22.9 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesCounty RD 629
CrossesLake Slu
LocationS 25 T 24 N R 7 E
RouteCounty Highway 629
Coordinates36.69782, -90.26295
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
Deck7 GoodSome minor problems.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
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 rating64.5 US tons
Inventory rating40.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length75 ft (22.9 m)
Longest span75 ft (22.9 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2024)
Projected traffic135 by 2044
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 629 over Lake Slu built?

It was built in 1999, making it 26 years old in 2025.

What condition is County RD 629 over Lake Slu 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 November 2023.

How much traffic does County RD 629 over Lake Slu carry?

About 100 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is County RD 629 over Lake Slu?

The structure is 75 ft (22.9 m) long with a longest span of 75 ft (22.9 m) and a deck 27 ft wide.

Who owns County RD 629 over Lake Slu?

It is owned by the County Highway Agency.