Texas State Highway 78

State Highway 78
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Route information
	Maintained by TxDOT
Length:	90.83 mi (146.18 km)
Existed:	1926 – present
Major junctions
South end:	I-30 at Dallas
	I-635; US 380; US 69; US 82
North end:	OK 78
Highway system

State Highway 78 or SH 78 is a state highway that follows surface roads in a predominantly southwest-to-northeast direction in the Dallas area before traveling 90 miles (145 km) north-northeast to the Oklahoma State border.

Route description

The highway's southern terminus is at Interstate 30 in Dallas. From there, it follows Grand Avenue along White Rock Lake and then Garland Road into Garland as it passes Interstate 635. In downtown Garland, Highway 78 follows the central streets of Avenues B and D before joining Lavon Drive and moving northeastward, where it formerly was the eastern terminus of the President George Bush Turnpike, which has since been extended to Interstate 30.

It continues to the northeast through Sachse and Wylie, crossing between Lake Ray Hubbard and Lake Lavon. It passes through Lavon before turning north through Farmersville and Blue Ridge. At SH 160, just before SH 121, SH 78 turns east, continuing to Leonard before turning northeast again to Bailey. At Bailey, SH 78 turns north and cuts through Bonham (as Center Street) just before it reaches the border with Oklahoma, where it crosses a 1938 truss bridge over the Red River. The route continues as Oklahoma State Highway 78 through Durant to its terminus at Tishomingo.

History

The highway was originally designated in 1926 along its current route. Part of this route was previously designated as SH 5C.

SH 78A was a spur designated by 1928 from Desert to Denison. This spur was renumbered as SH 160 by 1933.

The section of the highway between I-30 and SH 66 used to be part of U.S. 67 until sometime in the 60s.

Flooding

In 1990 SH 78 was flooded, as engineers at the Lake Lavon Dam decided to release the water from the lake into the East Fork of the Trinity River. For a month and a half, the traffic going between Wylie and the Eastern portion of Collin County was diverted to go through the city of Rockwall, a nearly 20-mile (32 km) detour. The railroad that ran adjacent to the highway was completely washed out, and significant shoulder damage was done to the highway.

Junction List

County	Location	Destinations	Notes
Dallas	Dallas	I-30 (R.L. Thornton Freeway)	Southern terminus; I-30 exits 48B-49A
		Loop 12 (Buckner Boulevard)
		Spur 244 west (Northwest Highway) to I-635
	Garland	I-635 west (Lyndon B. Johnson Freeway)	I-635 exit 8
		SH 66 east
		Pres. George Bush Tpk.	Interchange
Collin	Wylie	FM 544 west
		FM 2514 north (Ballard Avenue)
		FM 3412 west (Brown Street)
	Lavon	SH 205 south – Rockwall
		Bus. SH 78 north – Lavon
		Bus. SH 78 south – Lavon
		FM 6 east – Caddo Mills
		Bus. SH 78 north – Copeville
		Bus. SH 78 south – Copeville
	Farmersville	US 380 – McKinney, Greenville	Interchange
	Farmersville	Bus. SH 78 north
		Bus. SH 78 south – Farmersville
		FM 2756 west
		Bus. SH 78 north – Blue Ridge
	Blue Ridge	FM 981 – Blue Ridge, Celeste
		Bus. SH 78 south – Blue Ridge
		SH 160 north to SH 121 – Whitewright
Fannin		FM 815 north – Trenton
		FM 981 north	South end of FM 981 overlap
		FM 981 south	North end of FM 981 overlap
	Leonard	FM 896 north
		US 69 south – Celeste	South end of US 69 overlap
		US 69 north / Spur 241 west – Whitewright	North end of US 69 overlap
		FM 1553 north
	Bailey	FM 816 south
	Bailey	SH 11 – Whitewright, Wolfe City
		FM 1552 east
		FM 1553 west
		FM 68 east
		FM 1629 south
		FM 271 south – Bonham State Park
	Bonham	SH 56 – Ector, Dodd City
		Loop 205 (10th Street)
		US 82 – Sherman, Paris
		FM 898 north
		SH 121 south – Melissa, McKinney
		FM 1753 west
		FM 1396 east
		FM 274 west
Red River		State Highway 78 Bridge — Highway continues into Oklahoma as SH-78
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus