Highway Designation File

Transportation Planning and Programming Division
Current Description-Effective Date-Authority


Certified Mileage (Open to Traffic)
85.563 2010

STATE HIGHWAY NO. 121

Minute Order 016701, dated 09/26/1939

From a point on US 77 in Denton County via Grapevine to Fort Worth. General redescription of Highway System.



Minute Order 018766, dated 11/24/1941

From a point on US 77 south of Lewisville via Grapevine to Fort Worth. Extended from a point on Old US 77 in Denton County, to a point on new US 77 south of Lewisville.



Minute Order 020339, dated 12/16/1941

From Fort Worth to Grapevine, thence across US 77 south of Lewisville, thence northeastward passing thru or near McKinney to Trenton, thence via Randolph to Bonham.  Extended from US 77 to Bonham; includes former FM 82.



Minute Order 053750, dated 11/20/1963; Adm. Cir. 004-1964, dated 01/01/1964

From Fort Worth to Grapevine, thence across US 77 south of Lewisville, thence northeastward passing thru or near McKinney to Trenton, thence via Randolph to SH 78 north of Bonham.  Extended from US 82 to SH 78 north of Bonham.



Minute Order 062550, dated 07/31/1969; Adm. Cir. 062-1969, dated 08/15/1969

No change in description.  Relocated in Tarrant County replacing SS 459.



Minute Order 068084, dated 10/04/1973; Adm. Cir. 131-1973, dated 11/15/1973

From FM 1187, west of Crowley, northeastward via Fort Worth, Grapevine, Lewisville, McKinney, Trenton and Randolph to SH 78 north of Bonham.  Extended southwestward and southward from IH 35W to FM 1187.



Minute Order 077236, dated 04/14/1980; Adm. Ltr. 005-1980, dated 05/15/1980

From FM 1187, west of Crowley, northward and eastward via Fort Worth, Hurst, Bedford, Grapevine, Lewisville, McKinney, Trenton, and Randolph to SH 78, north of Bonham.  (Tarrant, Dallas, Denton, Collin, and Fannin Counties)  New description; relocated in Bedford and Grapevine. Concurrent with SH 183, thence along Industrial Blvd over FM 157 to its junction with SH 114, thence eastward concurrent with SH 114 to the entrance of Dallas-Fort Worth Airport.



Minute Order 083516, dated 08/29/1985

No change to description.  (Tarrant, Dallas, Denton, Collin, and Fannin Counties)  Minute Order 068084, dated 10/04/1973 is hereby cancelled and readjusted as provided by Minute Order 083516.



Adm. Auth., dated 03/02/1989; Adm. Ltr. 005-1989

From SH 78 north of Bonham, southward to its junction with US 82; then concurrent southwestward with US 82; and then from another point on US 82 southwestward via Randolph and Trenton to its junction with US 75; and then concurrent with US 75 southward via McKinney to its junction with SH 121 west of Fairview; and then southwestward via The Colony, Lewisville, Grapevine and Bedford; and then concurrent with SH 183 westward and southwestward to IH 35 in Ft Worth, then southwestward and southward to FM 1187, west of Crowley, a distance of approximately 99.0 miles.  New description.



Minute Order 108041, dated 11/18/1999; DesLtr 02-1999, dated 11/19/1999

From SH 78 north of Bonham, southward to its junction with US 82; then concurrent southwestward with US 82; then from another point on US 82, southwestward via Randolph and Trenton to its junction with US 75; then concurrent with US 75 southward via McKinney to its junction with SH 121 west of Fairview; then southwestward via The Colony, Lewisville, Grapevine, and Bedford, then southwestward via Coppell to Ft. Worth, then southwestward and southward to FM 1187, west of Crowley, a distance of approximately 100 miles. (Fannin, Collin, Denton, Dallas, Tarrant, and Johnson Counties)  New description; at District’s request, SS 553 redesignated as segment of SH 121.


Minute Order 109187, dated 02/27/2003; DesLtr 01-2003, dated 04/04/2003

From SH 78 north of Bonham, southward to its junction with US 82; then concurrent southwestward with US 82; then from another point on US 82, southwestward via Randolph and Trenton to its junction with US 75; then concurrent with US 75 southward via McKinney to its junction with SH 121 west of Fairview; then southwestward via The Colony, Lewisville, Grapevine, and Bedford; then southwestward via Coppell to Ft. Worth, then southwestward and southward to US 67 in the city of Cleburne, a distance of approximately 100 miles. (Fannin, Collin, Denton, Dallas, Tarrant, and Johnson Counties)  At District’s request, SH 121 extended along a new location to US 67 in Cleburne.



[Chisholm Trail Parkway-- On SH 121 between FM 1187 in Tarrant County and US 67 in Johnson County. HB 1654-ENR, dated 05/22/2003]