Resting on road. After photos, it coiled and then moved off road.
Rochound State Park
Bass Canyon, Muleshoe Ranch
Adult DOR on Hwy 90 ~ 18 miles E of Hwy 385. GTS 792. SRSU 6008 (Herpetology collection at Sul Ross State University, Alpine, Texas).
West of Willcox on Airport Rd
Crotalus molossus is a venomous pit viper species found in the southwestern United States and Mexico. Four subspecies are currently recognized, including the nominate subspecies described here.