US Bridges

County RD 504 over Shawnee CR

Good

Shannon County, Missouri · S 6 T 28 N R 3 W · Structure no. 15344

Built
1991
34 years old
Condition
Good
inspected January 2025
Type
Culvert
Concrete
Length
63 ft
4 main spans
Daily traffic
75
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 504 over Shawnee CR is a concrete culvert carrying County RD 504 over Shawnee CR in Shannon 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 good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 75 vehicles a day, roughly 10% of them trucks, projected to reach 90 by 2043. The structure is 63 ft (19.2 m) long and 30 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesCounty RD 504
CrossesShawnee CR
LocationS 6 T 28 N R 3 W
RouteCounty Highway 91
CountyShannon County
StateMissouri
Coordinates37.1297, -91.3246
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
Channel and channel protection7 GoodSome minor problems.
Culvert8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHS 20
Structure length63 ft (19.2 m)
Longest span14 ft (4.3 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2023)
Projected traffic90 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 504 over Shawnee CR built?

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

What condition is County RD 504 over Shawnee CR 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 January 2025.

How much traffic does County RD 504 over Shawnee CR carry?

About 75 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD 504 over Shawnee CR?

The structure is 63 ft (19.2 m) long with a longest span of 14 ft (4.3 m) and a deck 30 ft wide.

Who owns County RD 504 over Shawnee CR?

It is owned by the County Highway Agency.