US Bridges

N Point Prairie RD over Copper CR

Good

St. Charles County, Missouri · S 21 T 47 N R 1 E · Structure no. 35809

Built
2008
17 years old
Condition
Good
inspected February 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
3,100
2024 count
Owner
County
County Highway Agency

About this bridge

N Point Prairie RD over Copper CR is a concrete culvert carrying N Point Prairie RD over Copper CR in St. Charles County, Missouri. It was built in 2008, so it is 17 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 3,100 vehicles a day, roughly 5% of them trucks, projected to reach 4,805 by 2044. The structure is 21 ft (6.3 m) long and 38 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesN Point Prairie RD
CrossesCopper CR
LocationS 21 T 47 N R 1 E
RouteCounty Highway 13
Coordinates38.8195, -90.90597
Functional classUrban Collector

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
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width38 ft (11.5 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,100 (2024)
Projected traffic4,805 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 N Point Prairie RD over Copper CR built?

It was built in 2008, making it 17 years old in 2025.

What condition is N Point Prairie RD over Copper 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 February 2024.

How much traffic does N Point Prairie RD over Copper CR carry?

About 3,100 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is N Point Prairie RD over Copper CR?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m) and a deck 38 ft wide.

Who owns N Point Prairie RD over Copper CR?

It is owned by the County Highway Agency.