Travelers on I-80 may be used to keeping an eye out for animals crossing or near the roadway but it’s likely no traveler was prepared for the animals crossing in Sweetwater County this week. According to the Sweetwater County Sheriff’s Office, deputies and state troopers helped with traffic control as 5,000 head of sheep moved across I-80 on Monday and Tuesday. Sheriff Mike Lowell explains that mounted herders are driving their sheep north from winter range south of Rock Springs to the spring lambing grounds. The flocks crossed west of Rock Springs without incident.