US Bridges

Spencer RD over NS RR

Good

St. Charles County, Missouri · S 1799 T 47 N R 4 E · Structure no. 28499

Built
1996
29 years old
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
155 ft
3 main spans
Daily traffic
5,000
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Spencer RD over NS RR is a prestressed concrete continuous stringer/multi-beam or girder carrying Spencer RD over NS RR in St. Charles County, Missouri. It was built in 1996, so it is 29 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 5,000 vehicles a day, roughly 5% of them trucks, projected to reach 7,750 by 2044. The structure is 155 ft (47.2 m) long and 61 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesSpencer RD
CrossesNS RR
LocationS 1799 T 47 N R 4 E
RouteCity Street 0
Coordinates38.80208, -90.60297
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to 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 rating48.6 US tons
Inventory rating29.8 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length155 ft (47.2 m)
Longest span59 ft (18 m)
Deck width61 ft (18.5 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,000 (2024)
Projected traffic7,750 by 2044
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 over NS RR built?

It was built in 1996, making it 29 years old in 2025.

What condition is Spencer RD over NS RR 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 January 2024.

How much traffic does Spencer RD over NS RR carry?

About 5,000 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Spencer RD over NS RR?

The structure is 155 ft (47.2 m) long with a longest span of 59 ft (18 m) and a deck 61 ft wide.

Who owns Spencer RD over NS RR?

It is owned by the City or Municipal Highway Agency.