The Etowah Water and Sewer Authority continues to make plans for a reservoir along Shoal Creek, although the property owner hasn’t agreed to join in the project.The proposed 2,000-acre reservoir would be built on the hilly wooded landscape of Dawson Forest, a 10,000-acre tract the city of Atlanta has owned since the early 1970s.The project would cost an estimated $650 million over an eight- to 12-year construction period. Officials propose selling water to the rest of the region at a rate of about 100 million gallons a day.The authority was presented an update on the project last week by its partner, American Water Corp.