US Bridges

Mo 115 S over Trra RR

Fair

St. Louis city, Missouri · S 31 T 46 N R 7 E · Structure no. 30666

Built
1998
27 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete
Length
42 ft
1 main span
Daily traffic
13,739
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 115 S over Trra RR is a concrete slab carrying Mo 115 S over Trra RR in St. Louis city, Missouri. It was built in 1998, so it is 27 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 13,739 vehicles a day, roughly 9% of them trucks, projected to reach 19,235 by 2044. The structure is 42 ft (12.8 m) long and 79 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMo 115 S
CrossesTrra RR
LocationS 31 T 46 N R 7 E
RouteState Highway 115
CountySt. Louis city
StateMissouri
Coordinates38.68411, -90.26832
Functional classUrban Other Principal 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Last inspectionJuly 2023
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 rating97.2 US tons
Inventory rating58.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length42 ft (12.8 m)
Longest span41 ft (12.5 m)
Deck width79 ft (24 m)
Roadway width62 ft (18.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,739 (2024)
Projected traffic19,235 by 2044
Trucks9%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 Mo 115 S over Trra RR built?

It was built in 1998, making it 27 years old in 2025.

What condition is Mo 115 S over Trra RR 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 July 2023.

How much traffic does Mo 115 S over Trra RR carry?

About 13,739 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Mo 115 S over Trra RR?

The structure is 42 ft (12.8 m) long with a longest span of 41 ft (12.5 m) and a deck 79 ft wide.

Who owns Mo 115 S over Trra RR?

It is owned by the State Highway Agency.