FULTON COUNTY — Ten deputies in the Fulton County Sheriff's Department will soon cover what was once a 21-officer road patrol unit, an expected strain on the agency's already limited resources. One temporary deputy position will end on Friday and a full-timer is expected to leave by month's end. These losses fall on the eve of the summer season when thousands of visitors dot southern Adirondack communities such as Caroga and Northville. With reduced staff, deputies are expected to take less time covering boat patrol duties. "We're not going to have as many people out on the [Great Sacandaga Lake] because our…