US Bridges

Richland School RD over Prairie CR

Good

Boone County, Missouri · S 33 T 50 N R 14 W · Structure no. 14551

Built
1981
44 years old
Condition
Good
inspected December 2024
Type
Tee Beam
Prestressed Concrete
Length
101 ft
2 main spans
Daily traffic
25
2023 count
Owner
County
County Highway Agency

About this bridge

Richland School RD over Prairie CR is a prestressed concrete tee beam carrying Richland School RD over Prairie CR in Boone County, Missouri. It was built in 1981, so it is 44 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 25 vehicles a day, roughly 10% of them trucks, projected to reach 48 by 2043. The structure is 101 ft (30.8 m) long and 23 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesRichland School RD
CrossesPrairie CR
LocationS 33 T 50 N R 14 W
RouteCounty Highway 70
CountyBoone County
StateMissouri
Coordinates39.07892, -92.50711
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length101 ft (30.8 m)
Longest span50 ft (15.2 m)
Deck width23 ft (6.9 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2023)
Projected traffic48 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Richland School RD over Prairie CR built?

It was built in 1981, making it 44 years old in 2025.

What condition is Richland School RD over Prairie 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 December 2024.

How much traffic does Richland School RD over Prairie CR carry?

About 25 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Richland School RD over Prairie CR?

The structure is 101 ft (30.8 m) long with a longest span of 50 ft (15.2 m) and a deck 23 ft wide.

Who owns Richland School RD over Prairie CR?

It is owned by the County Highway Agency.