US Bridges

SH 78 over Elm Creek Relief

Good

Collin County, Texas · 4.60 MI S of US 380 · Structure no. 180430028101035

Built
1972
53 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
160 ft
4 main spans
Daily traffic
8,406
2022 count
Owner
State
State Highway Agency

About this bridge

SH 78 over Elm Creek Relief is a concrete stringer/multi-beam or girder carrying SH 78 over Elm Creek Relief in Collin County, Texas. It was built in 1972, so it is 53 years old, older than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 8,406 vehicles a day, roughly 10% of them trucks, projected to reach 8,330 by 2040. The structure is 160 ft (48.8 m) long and 50 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesSH 78
CrossesElm Creek Relief
Location4.60 MI S of US 380
RouteState Highway 78
StateTexas
Coordinates33.10268, -96.4109
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating45 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length160 ft (48.8 m)
Longest span40 ft (12.2 m)
Deck width50 ft (15.3 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,406 (2022)
Projected traffic8,330 by 2040
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed6.2 mi (10 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 78 over Elm Creek Relief built?

It was built in 1972, making it 53 years old in 2025.

What condition is SH 78 over Elm Creek Relief in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does SH 78 over Elm Creek Relief carry?

About 8,406 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is SH 78 over Elm Creek Relief?

The structure is 160 ft (48.8 m) long with a longest span of 40 ft (12.2 m) and a deck 50 ft wide.

Who owns SH 78 over Elm Creek Relief?

It is owned by the State Highway Agency.