Highway Designation File

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


Certified Mileage (Open to Traffic)
13.117 2010

FARM TO MARKET ROAD NO. 421

Minute Order 021215, dated 06/13/1945 (Date of Agreement)

From US 69 at Ariola westward 8.2 miles.  (Hardin County)  New Designation.



Minute Order 025713, dated 11/23/1948

From SH 326 north of Sour Lake, eastward to junction US 69 at Ariola, a distance of approximately 13.0 miles.  (Hardin County)  Extended to junction SH 326.



Minute Order 027111, dated 07/15/1949

From US 69 at Ariola westward 8.2 miles.  (Hardin County)  Section from junction SH 326, 4.8 miles eastward, cancelled.



Minute Order 031209, dated 11/20/1951

From US 69 at Ariola westward a distance of approximately 10.1 miles.  (Hardin County)  Extended approximately 1.9 miles.



Minute Order 033275, dated 12/17/1952

From SH 326 northeastward to US 69 at Ariola, a distance of approximately 12.4 miles.  (Hardin County)  Extended approximately 2.8 miles to SH 326.



Minute Order 061260, dated 07/11/1968; Adm. Cir. 074-1968, dated 09/01/1968

From SH 326 eastward approximately 13.0 miles via Ariola to US 96.  (Hardin County)  Extended eastward approx. 0.8 mile from US 69 to US 96.



Minute Order 105686, dated 06/27/1995; DesLtr 03-1995, dated 06/30/1995
Minute Order 115371, dated 11/15/2018 (Rescinds Minute Order 105686)

Minute Order 105686: From SH 326 eastward approx. 12.231 miles via Ariola to US 69. (Hardin County)  Mileage from US 69 eastward to US 96 transferred to UR 421. ["Transferred" mileage, as noted on the Highway Designation File page for UR 421, is approximately 0.769 mile.]

Minute Order 115371 general description: Minute Order 115371 rescinds Minute Order 105686. The result of this rescission is the elimination of the Urban Road (UR) system. The Farm to Market (FM) and Ranch to Market (RM) roadways which were intended to be redesignated as Urban Roads under the provisions of Minute Order 105686 revert back to their FM/RM designations. Minute Order 115371 declares that the provisions of Minute Order 105686 were never implemented, and although the UR designations were in effect during the interim between these two Minute Orders, the affected roadways continued to be referred to by their FM or RM designations. Only the Highway Designation Files made reference to the UR designations during this interim period. Upon the passing of Minute Order 115371, the affected Highway Designation Files have been updated retroactively to reflect the FM/RM designations.

Minute Order 115371 as it affects FM 421: Any mileage that was previously described as "transferred to UR 421" reverts back to FM 421. This is retroactive to the date of passage of Minute Order 105686. The Highway Designation File page for UR 421 has been removed.