US Bridges

James S Mcdonnell over Is 70

Fair

St. Louis County, Missouri · S 656 T 46 N R 6 E · Structure no. 3456

Built
1984
41 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
264 ft
2 main spans
Daily traffic
8,406
2024 count
Owner
State
State Highway Agency

About this bridge

James S Mcdonnell over Is 70 is a steel continuous stringer/multi-beam or girder carrying James S Mcdonnell over Is 70 in St. Louis County, Missouri. It was built in 1984, so it is 41 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 8,406 vehicles a day, roughly 5% of them trucks, projected to reach 12,609 by 2044. The structure is 264 ft (80.5 m) long and 46 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesJames S Mcdonnell
CrossesIs 70
LocationS 656 T 46 N R 6 E
RouteCity Street 0
CountySt. Louis County
StateMissouri
Coordinates38.73321, -90.34382
Functional classUrban Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating37.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length264 ft (80.5 m)
Longest span115 ft (35.1 m)
Deck width46 ft (13.9 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,406 (2024)
Projected traffic12,609 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

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 70 built?

It was built in 1984, making it 41 years old in 2025.

What condition is James S Mcdonnell over Is 70 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 September 2024.

How much traffic does James S Mcdonnell over Is 70 carry?

About 8,406 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is James S Mcdonnell over Is 70?

The structure is 264 ft (80.5 m) long with a longest span of 115 ft (35.1 m) and a deck 46 ft wide.

Who owns James S Mcdonnell over Is 70?

It is owned by the State Highway Agency.