US Bridges

Rt W S over Is 70

Poor

St. Charles County, Missouri · S 19 T 47 N R 1 E · Structure no. 796

Built
1963
62 years old, rebuilt 1984
Condition
Poor
inspected September 2023
Type
Slab
Concrete Continuous
Length
219 ft
4 main spans
Daily traffic
10,399
2024 count
Owner
State
State Highway Agency

About this bridge

Rt W S over Is 70 is a concrete continuous slab carrying Rt W S over Is 70 in St. Charles County, Missouri. It was built in 1963 and reconstructed in 1984, so it is 62 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 10,399 vehicles a day, roughly 21% of them trucks, projected to reach 20,278 by 2044. The structure is 219 ft (66.8 m) long and 32 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesRt W S
CrossesIs 70
LocationS 19 T 47 N R 1 E
RouteState Highway 0W
CountySt. Charles County
StateMissouri
Coordinates38.81666, -90.95358
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be 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 typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length219 ft (66.8 m)
Longest span60 ft (18.3 m)
Deck width32 ft (9.7 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,399 (2024)
Projected traffic20,278 by 2044
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed18 mi (29 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.4 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Rt W S over Is 70 built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1984.

What condition is Rt W S over Is 70 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does Rt W S over Is 70 carry?

About 10,399 vehicles per day (2024 count), of which roughly 21% are trucks.

How long is Rt W S over Is 70?

The structure is 219 ft (66.8 m) long with a longest span of 60 ft (18.3 m) and a deck 32 ft wide.

Who owns Rt W S over Is 70?

It is owned by the State Highway Agency.