US Bridges

James S Mcdonnell over Is 270

Fair

St. Louis County, Missouri · S 278 T 47 N R 3 E · Structure no. 29117

Built
2002
23 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
193 ft
2 main spans
Daily traffic
16,444
2024 count
Owner
State
State Highway Agency

About this bridge

James S Mcdonnell over Is 270 is a steel continuous stringer/multi-beam or girder carrying James S Mcdonnell over Is 270 in St. Louis County, Missouri. It was built in 2002, so it is 23 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 16,444 vehicles a day, roughly 5% of them trucks, projected to reach 23,022 by 2044. The structure is 193 ft (58.8 m) long and 135 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesJames S Mcdonnell
CrossesIs 270
LocationS 278 T 47 N R 3 E
RouteCity Street 0
CountySt. Louis County
StateMissouri
Coordinates38.77781, -90.38927
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.3 US tons
Inventory rating53.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length193 ft (58.8 m)
Longest span96 ft (29.4 m)
Deck width135 ft (41.2 m)
Roadway width133 ft (40.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,444 (2024)
Projected traffic23,022 by 2044
Trucks5%
Lanes on structure9
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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 James S Mcdonnell over Is 270 built?

It was built in 2002, making it 23 years old in 2025.

What condition is James S Mcdonnell over Is 270 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 August 2024.

How much traffic does James S Mcdonnell over Is 270 carry?

About 16,444 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is James S Mcdonnell over Is 270?

The structure is 193 ft (58.8 m) long with a longest span of 96 ft (29.4 m) and a deck 135 ft wide.

Who owns James S Mcdonnell over Is 270?

It is owned by the State Highway Agency.