US Bridges

Firethorn DR over Trib of Two Mile C

Good

St. Louis County, Missouri · S 26 T 45 N R 5 E · Structure no. 33422

Built
2011
14 years old
Condition
Good
inspected January 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
56 ft
1 main span
Daily traffic
400
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Firethorn DR over Trib of Two Mile C is a prestressed concrete box beam or girders - multiple carrying Firethorn DR over Trib of Two Mile C in St. Louis County, Missouri. It was built in 2011, so it is 14 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 400 vehicles a day, roughly 3% of them trucks, projected to reach 540 by 2043. The structure is 56 ft (17.1 m) long and 31 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesFirethorn DR
CrossesTrib of Two Mile C
LocationS 26 T 45 N R 5 E
RouteCity Street 0
Coordinates38.61505, -90.42767
Functional classUrban Local

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.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.5 US tons
Inventory rating39.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length56 ft (17.1 m)
Longest span53 ft (16.2 m)
Deck width31 ft (9.4 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2023)
Projected traffic540 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Firethorn DR over Trib of Two Mile C built?

It was built in 2011, making it 14 years old in 2025.

What condition is Firethorn DR over Trib of Two Mile C 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 Firethorn DR over Trib of Two Mile C carry?

About 400 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Firethorn DR over Trib of Two Mile C?

The structure is 56 ft (17.1 m) long with a longest span of 53 ft (16.2 m) and a deck 31 ft wide.

Who owns Firethorn DR over Trib of Two Mile C?

It is owned by the City or Municipal Highway Agency.