US Bridges

Illinois Ave over Spur 408

Fair

Dallas County, Texas · 1.35 MI N of Kiest Blvd · Structure no. 180570300001014

Built
1975
50 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
480 ft
2 main spans
Daily traffic
16,158
2019 count
Owner
State
State Highway Agency

About this bridge

Illinois Ave over Spur 408 is a prestressed concrete stringer/multi-beam or girder carrying Illinois Ave over Spur 408 in Dallas County, Texas. It was built in 1975, so it is 50 years old, older than the Texas average of 44.4 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 16,158 vehicles a day, roughly 3% of them trucks, projected to reach 22,621 by 2040. The structure is 480 ft (146.3 m) long and 94 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesIllinois Ave
CrossesSpur 408
Location1.35 MI N of Kiest Blvd
RouteCity Street 35
CountyDallas County
StateTexas
Coordinates32.72054, -96.91775
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2 (+4 approach)
Design loadHS 20
Structure length480 ft (146.3 m)
Longest span105 ft (32 m)
Deck width94 ft (28.7 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,158 (2019)
Projected traffic22,621 by 2040
Trucks3%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Illinois Ave over Spur 408 built?

It was built in 1975, making it 50 years old in 2025.

What condition is Illinois Ave over Spur 408 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 October 2023.

How much traffic does Illinois Ave over Spur 408 carry?

About 16,158 vehicles per day (2019 count), of which roughly 3% are trucks.

How long is Illinois Ave over Spur 408?

The structure is 480 ft (146.3 m) long with a longest span of 105 ft (32 m) and a deck 94 ft wide.

Who owns Illinois Ave over Spur 408?

It is owned by the State Highway Agency.