US Bridges

S Point Prairie RD over Unknown Crk

Good

St. Charles County, Missouri · S 10 T 46 N R 1 E · Structure no. 36884

Built
2018
7 years old
Condition
Good
inspected February 2024
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
319
2024 count
Owner
County
County Highway Agency

About this bridge

S Point Prairie RD over Unknown Crk is a concrete culvert carrying S Point Prairie RD over Unknown Crk in St. Charles County, Missouri. It was built in 2018, so it is 7 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 319 vehicles a day, roughly 10% of them trucks, projected to reach 702 by 2044. The structure is 22 ft (6.7 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesS Point Prairie RD
CrossesUnknown Crk
LocationS 10 T 46 N R 1 E
RouteCounty Highway 322
Coordinates38.7575, -90.89639
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width29 ft (8.7 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic319 (2024)
Projected traffic702 by 2044
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was S Point Prairie RD over Unknown Crk built?

It was built in 2018, making it 7 years old in 2025.

What condition is S Point Prairie RD over Unknown Crk 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 February 2024.

How much traffic does S Point Prairie RD over Unknown Crk carry?

About 319 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is S Point Prairie RD over Unknown Crk?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 29 ft wide.

Who owns S Point Prairie RD over Unknown Crk?

It is owned by the County Highway Agency.