US Bridges

US 50 E over Is 255

Poor

St. Louis County, Missouri · S 35 T 44 N R 6 E · Structure no. 1085

Built
1969
56 years old
Condition
Poor
inspected July 2024
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
306 ft
4 main spans
Daily traffic
7,946
2024 count
Owner
State
State Highway Agency

About this bridge

US 50 E over Is 255 is a concrete continuous box beam or girders - single or spread carrying US 50 E over Is 255 in St. Louis County, Missouri. It was built in 1969, so it is 56 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 7,946 vehicles a day, roughly 10% of them trucks, projected to reach 11,124 by 2044. The structure is 306 ft (93.3 m) long and 27 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesUS 50 E
CrossesIs 255
LocationS 35 T 44 N R 6 E
RouteU.S. Route 50
CountySt. Louis County
StateMissouri
Coordinates38.50201, -90.32218
Functional classUrban Other Principal Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.4 US tons
Inventory rating47.6 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length306 ft (93.3 m)
Longest span92 ft (28 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,946 (2024)
Projected traffic11,124 by 2044
Trucks10%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed11.2 mi (18 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3.1 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 50 E over Is 255 built?

It was built in 1969, making it 56 years old in 2025.

What condition is US 50 E over Is 255 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.

How much traffic does US 50 E over Is 255 carry?

About 7,946 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is US 50 E over Is 255?

The structure is 306 ft (93.3 m) long with a longest span of 92 ft (28 m) and a deck 27 ft wide.

Who owns US 50 E over Is 255?

It is owned by the State Highway Agency.