Texas State Highway 66

State Highway 66
Route information
Maintained by TxDOT
Length	34.96 mi[1] (56.26 km)
Existed	by 1933–present
Major junctions
West end	SH 78 at Garland
East end	US 69 / US 380 at Greenville
Location
Country	United States
State	Texas
Counties	Dallas, Rockwall, Collin, Hunt
Highway system
Highways in Texas Interstate US State Toll Loops Spurs FM/RM Park Rec
← US 66 → US 67

State Highway 66 (SH 66) is a state highway in the U.S. state of Texas, connecting Garland to Greenville. The route runs roughly parallel to Interstate 30, passing through Rowlett, Rockwall, Fate, Royse City, and Caddo Mills. It also crosses Lake Ray Hubbard twice. It is known locally as Lakeview Parkway in Rowlett and as Avenue B in Garland.

SH 66 was previously designated first on August 21, 1923 as a route from Bogata northeast through Clarksville toward the Oklahoma town of Idabel, replacing part of SH 37.^[2] On June 24, 1931, this route had been added as a northern extent of SH 37, and SH 66 was instead assigned along an ambitious route spanning the entire state from Wichita Falls to Pharr, replacing part of SH 25, part of SH 24, part of SH 108 (causing the rest of SH 108 to be cancelled in exchange of mileage, but that section was restored on July 24, 1932), all of SH 145, and part of SH 12.^[3] On November 30, 1932, it was extended south to the Rio Grande near Hidalgo, replacing part of SH 4, which was rerouted west.^[4] On October 17, 1933, it was extended to Oklahoma following SH 79.^[5] On July 15, 1935, everything north of Wichita Falls was cancelled and the section from the Brazos River to Stephenville was cancelled. ^[6] On November 5, 1935, the section from the Brazos River to Stephenville was restored.^[7] On February 11, 1937, the section north of Wichita Falls was restored, but as part of SH 79 only.^[8] On September 26, 1939, this entire second route was cancelled in favor of U.S. Highway 281, with one section from US 281 to the Hidalgo International Bridge becoming a spur of US 281, but Spur 241 in 1961.

The current route was designated on November 30, 1961, replacing FM 7 and U.S. Highway 67, which was rerouted atop I-30.

County	Location	mi	km	Destinations	Notes
Dallas	Garland	0.0	0.0	SH 78 – Dallas, Wylie
	Rowlett	4.4	7.1	Pres. George Bush Turnpike
Rockwall	Rockwall	10.3	16.6	SH 205 south (Alamo Road)
		10.4	16.7	SH 205 north (Goliad Street)
		11.5	18.5	FM 1141 north to FM 552
	Fate	13.0	20.9	FM 3549 to I-30
		15.1	24.3	FM 551 south to I-30
	​	18.1	29.1	FM 552 west
	​	18.3	29.5	FM 1138 north – Nevada
	Royse City	19.6	31.5	FM 548 south
Collin		20.5	33.0	FM 1777 north – Josephine
Hunt	​	22.8	36.7	FM 2642 south
	Caddo Mills	27.3	43.9	FM 1565 south – Union Valley
		27.6	44.4	FM 6 east – Josephine
		28.2	45.4	FM 36 south	Southern end of FM 36 concurrency
		28.3	45.5	FM 36 north	Northern end of FM 36 concurrency
	​	33.2	53.4	FM 1570 east
	​	33.6	54.1	FM 3211 west – Clinton
	Greenville	35.0	56.3	US 69 / US 380 – Denison, McKinney, Emory
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus