US Bridges

SH 78 over Smiths Creek

Fair

Dallas County, Texas · 1.65 MI N of IH 635 · Structure no. 180570000902007

Built
1923
102 years old, rebuilt 1965
Condition
Fair
inspected December 2023
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
20,828
2020 count
Owner
State
State Highway Agency

About this bridge

SH 78 over Smiths Creek is a concrete slab carrying SH 78 over Smiths Creek in Dallas County, Texas. It was built in 1923 and reconstructed in 1965, so it is 102 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 20,828 vehicles a day, roughly 7% of them trucks, projected to reach 28,740 by 2033. The structure is 23 ft (7 m) long and 91 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSH 78
CrossesSmiths Creek
Location1.65 MI N of IH 635
RouteState Highway 78
StateTexas
Coordinates32.88865, -96.65319
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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span23 ft (7 m)
Deck width91 ft (27.6 m)
Roadway width77 ft (23.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,828 (2020)
Projected traffic28,740 by 2033
Trucks7%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$5,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 78 over Smiths Creek built?

It was built in 1923, making it 102 years old in 2025. It was reconstructed in 1965.

What condition is SH 78 over Smiths Creek 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 December 2023.

How much traffic does SH 78 over Smiths Creek carry?

About 20,828 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is SH 78 over Smiths Creek?

The structure is 23 ft (7 m) long with a longest span of 23 ft (7 m) and a deck 91 ft wide.

Who owns SH 78 over Smiths Creek?

It is owned by the State Highway Agency.