US Bridges

Union RD over Gravois CR

FairPosted for load

St. Louis County, Missouri · S 26 T 44 N R 6 E · Structure no. 15630

Built
1967
58 years old, rebuilt 1993
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
157 ft
2 main spans
Daily traffic
11,550
2024 count
Owner
County
County Highway Agency

About this bridge

Union RD over Gravois CR is a steel continuous stringer/multi-beam or girder carrying Union RD over Gravois CR in St. Louis County, Missouri. It was built in 1967 and reconstructed in 1993, so it is 58 years old, older 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. Its operating status is: posted for load restriction.

It carries about 11,550 vehicles a day, roughly 5% of them trucks, projected to reach 15,593 by 2044. The structure is 157 ft (47.9 m) long and 60 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesUnion RD
CrossesGravois CR
LocationS 26 T 44 N R 6 E
RouteCounty Highway 0
CountySt. Louis County
StateMissouri
Coordinates38.52208, -90.3201
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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.6 US tons
Inventory rating27.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length157 ft (47.9 m)
Longest span75 ft (22.9 m)
Deck width60 ft (18.2 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,550 (2024)
Projected traffic15,593 by 2044
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.9 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Union RD over Gravois CR built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 1993.

What condition is Union RD over Gravois CR 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 May 2024.

How much traffic does Union RD over Gravois CR carry?

About 11,550 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Union RD over Gravois CR?

The structure is 157 ft (47.9 m) long with a longest span of 75 ft (22.9 m) and a deck 60 ft wide.

Who owns Union RD over Gravois CR?

It is owned by the County Highway Agency.