US Bridges

US 380 over Big Branch Relief

Fair

Collin County, Texas · 1.0 MI E of FM 1827 · Structure no. 180430013503132

Built
1938
87 years old, rebuilt 1999
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
70 ft
9 main spans
Daily traffic
44,432
2023 count
Owner
State
State Highway Agency

About this bridge

US 380 over Big Branch Relief is a concrete culvert carrying US 380 over Big Branch Relief in Collin County, Texas. It was built in 1938 and reconstructed in 1999, so it is 87 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 44,432 vehicles a day, roughly 8% of them trucks, projected to reach 51,240 by 2037. The structure is 70 ft (21.3 m) long and 106 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesUS 380
CrossesBig Branch Relief
Location1.0 MI E of FM 1827
RouteU.S. Route 380
CountyCollin County
StateTexas
Coordinates33.19413, -96.56156
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans9
Design loadUnknown
Structure length70 ft (21.3 m)
Longest span7 ft (2.1 m)
Deck width106 ft (32.3 m)
Roadway width79 ft (24.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44,432 (2023)
Projected traffic51,240 by 2037
Trucks8%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed5 mi (8 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 380 over Big Branch Relief built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1999.

What condition is US 380 over Big Branch Relief 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 US 380 over Big Branch Relief carry?

About 44,432 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is US 380 over Big Branch Relief?

The structure is 70 ft (21.3 m) long with a longest span of 7 ft (2.1 m) and a deck 106 ft wide.

Who owns US 380 over Big Branch Relief?

It is owned by the State Highway Agency.