US Bridges

Midland Blvd E over Is 170

Fair

St. Louis County, Missouri · S 28 T 46 N R 6 E · Structure no. 2717

Built
1981
44 years old, rebuilt 2023
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
261 ft
3 main spans
Daily traffic
8,289
2024 count
Owner
State
State Highway Agency

About this bridge

Midland Blvd E over Is 170 is a steel continuous stringer/multi-beam or girder carrying Midland Blvd E over Is 170 in St. Louis County, Missouri. It was built in 1981 and reconstructed in 2023, so it is 44 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 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 8,289 vehicles a day, roughly 7% of them trucks, projected to reach 11,605 by 2044. The structure is 261 ft (79.6 m) long and 91 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMidland Blvd E
CrossesIs 170
LocationS 28 T 46 N R 6 E
RouteCity Street 0
CountySt. Louis County
StateMissouri
Coordinates38.69835, -90.34511
Functional classUrban Minor 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 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 geometry9: Superior to present desirable criteria
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 spans3
Design loadHS 20 + Mod
Structure length261 ft (79.6 m)
Longest span97 ft (29.6 m)
Deck width91 ft (27.8 m)
Roadway width89 ft (27 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,289 (2024)
Projected traffic11,605 by 2044
Trucks7%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 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 Midland Blvd E over Is 170 built?

It was built in 1981, making it 44 years old in 2025. It was reconstructed in 2023.

What condition is Midland Blvd E over Is 170 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 Midland Blvd E over Is 170 carry?

About 8,289 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is Midland Blvd E over Is 170?

The structure is 261 ft (79.6 m) long with a longest span of 97 ft (29.6 m) and a deck 91 ft wide.

Who owns Midland Blvd E over Is 170?

It is owned by the State Highway Agency.