US Bridges

Is 255 N over Crd Koch RD

Fair

St. Louis County, Missouri · S 3119 T 43 N R 7 E · Structure no. 2240

Built
1977
48 years old
Condition
Fair
inspected July 2024
Type
Slab
Concrete Continuous
Length
190 ft
4 main spans
Daily traffic
30,251
2024 count
Owner
State
State Highway Agency

About this bridge

Is 255 N over Crd Koch RD is a concrete continuous slab carrying Is 255 N over Crd Koch RD in St. Louis County, Missouri. It was built in 1977, so it is 48 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 5 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 30,251 vehicles a day, roughly 18% of them trucks, projected to reach 37,814 by 2044. The structure is 190 ft (57.9 m) long and 64 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 255 N
CrossesCrd Koch RD
LocationS 3119 T 43 N R 7 E
RouteInterstate 255
CountySt. Louis County
StateMissouri
Coordinates38.48934, -90.28439
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating40.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length190 ft (57.9 m)
Longest span59 ft (18 m)
Deck width64 ft (19.4 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,251 (2024)
Projected traffic37,814 by 2044
Trucks18%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Is 255 N over Crd Koch RD built?

It was built in 1977, making it 48 years old in 2025.

What condition is Is 255 N over Crd Koch RD 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 2024.

How much traffic does Is 255 N over Crd Koch RD carry?

About 30,251 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Is 255 N over Crd Koch RD?

The structure is 190 ft (57.9 m) long with a longest span of 59 ft (18 m) and a deck 64 ft wide.

Who owns Is 255 N over Crd Koch RD?

It is owned by the State Highway Agency.