Highway Designation File

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


Certified Mileage (Open to Traffic)
85.417 2010

FARM TO MARKET ROAD NO. 400

Minute Order 021215, dated 06/25/1945 (date of agreement)

From Idalou northward to the Hale County Line. (Lubbock County) New Designation.



Minute Order 021215, dated 07/09/1945 (date of agreement)

 From Idalou northward to FM 54 west of Petersburg. (Lubbock/Hale Counties)  Extended from Hale County Line to FM 54 west of Petersburg.



Minute Order 026057, dated 12/16/1948

From junction FM 54 west of Petersburg southward to junction US 62, east of Idalou, thence southward 12.2 miles to a county road. (Lubbock and Hale Counties)  Extended from US 62 southward 12.2 miles.



Adm. Order dated 03/19/1949

From junction FM 54 west of Petersburg, southward to junction US 62, east of Idalou, thence southward 12.2 miles to a County road, and from the Lubbock County Line southwestward via Wilson to junction US 87 north of Tahoka. (Lubbock, Hale and Lynn Counties)  FM 1074 canceled and that portion (15.7 miles) added.



Minute Orders  024206, dated 12/17/1947, 027844, dated 01/27/1950

From Plainview southward to junction US 62 east of Idalou, thence southward 12.2 miles to a County road, and from the Lubbock County Line southwestward via Wilson to junction US 87 north of Tahoka. (Lubbock, Hale, and Lynn Counties)  Extended from Plainview southward to an intersection with FM 54, a distance of approximately 21.0 miles.



Minute Order 030299, dated 05/23/1951

From Plainview southward to US 62 east of Idalou, thence southward to US 84 in Slayton and from another point on US 84 in Slayton southwestward via Wilson to US 87 north of Tahoka, a distance of approximately 69.6 miles. (Hale, Lubbock and Lynn Counties)  Extended approximately 2.6 miles southward to US 84 in Slayton and approximately 2.2 miles from US 84  in Slayton southward to Lynn County Line.



Minute Order 033269, dated 12/17/1952, Adm.Auth., dated 02/24/1953

From Swisher County Line southward via Pliainviiew, Idalou, Slaton, and Wilsonto US 87 north of Tahoka, 801 miles. (Hale, Lubbock, and Lynn Counties)  Extended approximately 10.6 miles, 6.2 miles of which transferred from FM 768. 



Minute Order 035196, dated 10/29/1953

From FM 145, 5.0 miles east of Kress southward via Plainview and Idalou to US 84 north of Slaton and from another point on US 84 south of Slaton southwestward via Wilson to US 87 north of Tahoka, a distance of approximately 85.2 miles. (Swisher, Hale, Lubbock, and Lynn Counties)  Extended approximately 5.1 miles northward to FM 145.



Minute Order 055459, dated 01/26/1965; Adm. Ltr., 002-1978

From FM 145, 5.0 miles east of Kress, southward via Plainview and Idalou to BU 84-E north of Slaton; and from another point on BU 84-E south of Slaton, southwestward to US 87 north of Tahoka, a total distance of approx. 85.6 miles. (Swisher, Hale, Lubbock, and Lynn Counties)  Old location US 84 redesignated SL 251 in Slaton.