US Bridges

Spur 408 SB over IH20 Conn E

Fair

Dallas County, Texas · Spur 408 & IH20 · Structure no. 180570300001298

Built
1975
50 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,165 ft
1 main span
Daily traffic
20,502
2019 count
Owner
State
State Highway Agency

About this bridge

Spur 408 SB over IH20 Conn E is a prestressed concrete stringer/multi-beam or girder carrying Spur 408 SB over IH20 Conn E 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 20,502 vehicles a day, projected to reach 28,703 by 2040. The structure is 1,165 ft (355.1 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSpur 408 SB
CrossesIH20 Conn E
LocationSpur 408 & IH20
RouteState Highway 408
CountyDallas County
StateTexas
Coordinates32.67139, -96.94713
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 2023
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 alignment6: Equal to present minimum criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+17 approach)
Design loadHS 20
Structure length1,165 ft (355.1 m)
Longest span90 ft (27.4 m)
Deck width32 ft (9.7 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,502 (2019)
Projected traffic28,703 by 2040
Trucks0%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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 Spur 408 SB over IH20 Conn E built?

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

What condition is Spur 408 SB over IH20 Conn E 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 2023.

How much traffic does Spur 408 SB over IH20 Conn E carry?

About 20,502 vehicles per day (2019 count).

How long is Spur 408 SB over IH20 Conn E?

The structure is 1,165 ft (355.1 m) long with a longest span of 90 ft (27.4 m) and a deck 32 ft wide.

Who owns Spur 408 SB over IH20 Conn E?

It is owned by the State Highway Agency.