Marin Water has hired a consulting firm that specializes in dam design and rehabilitation as it seeks to modernize the Nicasio Reservoir spillway. Seeger Dam, built in 1961, received a downgraded status from the California Division of Safety of Dams, from satisfactory to fair, this spring, after an evaluation identified design flaws. The California Department of Water Resources ordered the district to submit a repair plan by Dec. 1. The “fair” rating indicates the dam…