today, the green river runs through albert sommers' ranch.ng? >> sommers: my family's been doing this since about 1903. >> whitaker: albert's neighbor jeannie lockwood's family has been at it even longer. >> jeannie lockwood: this was my granddad's ranch. he homesteaded this in 1889. >> whitaker: her ranch is about 20 miles south of albert sommers' place. we joined her on horseback before dawn the day she started moving her cattle north... >> lockwood: there's that sun. it's going to peek out over the hill. >> whitaker: ...along the same path her family has trekked for 125 years. r thnext weeks yeah. >> whita g thening >> lockwood: or 3:00, or 2:30. >> whitaker: or 2:30. those early starts barely compare to what old-timers endured, when cowboys stayed out under the stars all night and the sun all day, until they got the herd to high pastures. >> sommers: well, i think we can go home. what do you think? >> whitaker: today, they go home after each day's drive. the next morning, they trailer their horses back to where they'd left the cattle, rou