US Bridges

Lake ST Louis Blvd over Is 70

Fair

St. Charles County, Missouri · S 26 T 47 N R 2 E · Structure no. 30138

Built
2003
22 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
134 ft
2 main spans
Daily traffic
7,148
2024 count
Owner
State
State Highway Agency

About this bridge

Lake ST Louis Blvd over Is 70 is a prestressed concrete continuous box beam or girders - multiple carrying Lake ST Louis Blvd over Is 70 in St. Charles County, Missouri. It was built in 2003, so it is 22 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 7,148 vehicles a day, roughly 3% of them trucks, projected to reach 12,866 by 2044. The structure is 134 ft (40.8 m) long and 84 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesLake ST Louis Blvd
CrossesIs 70
LocationS 26 T 47 N R 2 E
RouteCity Street 0
CountySt. Charles County
StateMissouri
Coordinates38.80402, -90.77069
Functional classUrban Minor 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
Deck7 GoodSome minor problems.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length134 ft (40.8 m)
Longest span67 ft (20.4 m)
Deck width84 ft (25.6 m)
Roadway width81 ft (24.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,148 (2024)
Projected traffic12,866 by 2044
Trucks3%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

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 Lake ST Louis Blvd over Is 70 built?

It was built in 2003, making it 22 years old in 2025.

What condition is Lake ST Louis Blvd over Is 70 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 Lake ST Louis Blvd over Is 70 carry?

About 7,148 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is Lake ST Louis Blvd over Is 70?

The structure is 134 ft (40.8 m) long with a longest span of 67 ft (20.4 m) and a deck 84 ft wide.

Who owns Lake ST Louis Blvd over Is 70?

It is owned by the State Highway Agency.