US Bridges

County RD 521 over Maries River

Good

Osage County, Missouri · S 24 T 42 N R 10 W · Structure no. 33498

Built
2011
14 years old
Condition
Good
inspected April 2023
Type
Slab
Concrete
Length
184 ft
4 main spans
Daily traffic
15
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 521 over Maries River is a concrete slab carrying County RD 521 over Maries River in Osage County, Missouri. It was built in 2011, so it is 14 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 15 vehicles a day, roughly 10% of them trucks, projected to reach 21 by 2043. The structure is 184 ft (56.1 m) long and 20 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesCounty RD 521
CrossesMaries River
LocationS 24 T 42 N R 10 W
RouteCounty Highway 131
CountyOsage County
StateMissouri
Coordinates38.36983, -91.98604
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating83.3 US tons
Inventory rating50.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans4
Design loadHS 25 or greater
Structure length184 ft (56.1 m)
Longest span46 ft (14 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2023)
Projected traffic21 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 521 over Maries River built?

It was built in 2011, making it 14 years old in 2025.

What condition is County RD 521 over Maries River 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 April 2023.

How much traffic does County RD 521 over Maries River carry?

About 15 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD 521 over Maries River?

The structure is 184 ft (56.1 m) long with a longest span of 46 ft (14 m) and a deck 20 ft wide.

Who owns County RD 521 over Maries River?

It is owned by the County Highway Agency.