US Bridges

Spencer RD S over Or 70 Is 70

Fair

St. Charles County, Missouri · S 1799 T 47 N R 4 E · Structure no. 11742

Built
1995
30 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
395 ft
6 main spans
Daily traffic
7,998
2024 count
Owner
State
State Highway Agency

About this bridge

Spencer RD S over Or 70 Is 70 is a prestressed concrete continuous stringer/multi-beam or girder carrying Spencer RD S over Or 70 Is 70 in St. Charles County, Missouri. It was built in 1995, so it is 30 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 7,998 vehicles a day, roughly 4% of them trucks, projected to reach 14,396 by 2044. The structure is 395 ft (120.4 m) long and 73 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSpencer RD S
CrossesOr 70 Is 70
LocationS 1799 T 47 N R 4 E
RouteCity Street 0
CountySt. Charles County
StateMissouri
Coordinates38.79853, -90.60348
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.3 US tons
Inventory rating54.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20 + Mod
Structure length395 ft (120.4 m)
Longest span92 ft (27.9 m)
Deck width73 ft (22.2 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,998 (2024)
Projected traffic14,396 by 2044
Trucks4%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 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 Spencer RD S over Or 70 Is 70 built?

It was built in 1995, making it 30 years old in 2025.

What condition is Spencer RD S over Or 70 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 Spencer RD S over Or 70 Is 70 carry?

About 7,998 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Spencer RD S over Or 70 Is 70?

The structure is 395 ft (120.4 m) long with a longest span of 92 ft (27.9 m) and a deck 73 ft wide.

Who owns Spencer RD S over Or 70 Is 70?

It is owned by the State Highway Agency.