US Bridges

Rt Dd N over Is 64

Fair

St. Charles County, Missouri · S 13 T 46 N R 2 E · Structure no. 11919

Built
2000
25 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
323 ft
4 main spans
Daily traffic
11,054
2024 count
Owner
State
State Highway Agency

About this bridge

Rt Dd N over Is 64 is a prestressed concrete continuous stringer/multi-beam or girder carrying Rt Dd N over Is 64 in St. Charles County, Missouri. It was built in 2000, so it is 25 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 11,054 vehicles a day, roughly 6% of them trucks, projected to reach 19,897 by 2044. The structure is 323 ft (98.5 m) long and 131 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesRt Dd N
CrossesIs 64
LocationS 13 T 46 N R 2 E
RouteState Highway 0DD
CountySt. Charles County
StateMissouri
Coordinates38.74907, -90.75349
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating103.2 US tons
Inventory rating59.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length323 ft (98.5 m)
Longest span82 ft (25 m)
Deck width131 ft (39.8 m)
Roadway width128 ft (39 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,054 (2024)
Projected traffic19,897 by 2044
Trucks6%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Rt Dd N over Is 64 built?

It was built in 2000, making it 25 years old in 2025.

What condition is Rt Dd N over Is 64 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2023.

How much traffic does Rt Dd N over Is 64 carry?

About 11,054 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is Rt Dd N over Is 64?

The structure is 323 ft (98.5 m) long with a longest span of 82 ft (25 m) and a deck 131 ft wide.

Who owns Rt Dd N over Is 64?

It is owned by the State Highway Agency.