Rivanna Reservoir

Rivanna Reservoir. The Rivanna Reservoir is a vital water supply impoundment located in central Virginia, formed by the damming of the Rivanna River. Owned and operated by the Rivanna Water & Sewer Authority, it serves as the primary drinking water source for the city of Charlottesville and portions of surrounding Albemarle County. The reservoir plays a significant role in regional water resource management, flood control, and provides limited opportunities for public recreation amidst a managed natural setting.

History

The need for a reliable public water supply for the growing community of Charlottesville led to the construction of the original dam in 1925, creating what was then known as the Ragged Mountain Reservoir. By the late 20th century, increasing demand and sedimentation concerns prompted regional authorities to seek a new primary source. The current dam on the Rivanna River was completed in 1986, establishing the modern reservoir and creating a more sustainable supply. This project was a key infrastructure achievement for the Rivanna Water & Sewer Authority, which was formed to manage water and wastewater services for the area. The development followed extensive hydrological studies and planning involving local government bodies like the Charlottesville City Council and the Albemarle County Board of Supervisors.

Geography and Hydrology

The reservoir is situated within the Piedmont region of Virginia, nestled in the rolling hills of Albemarle County. It is an impoundment on the Rivanna River, a tributary of the larger James River system which flows into the Chesapeake Bay. The watershed encompasses forested and agricultural lands upstream, influencing both water quality and quantity. The underlying geology consists primarily of metamorphic rocks characteristic of the Virginia Piedmont. The reservoir's hydrology is managed in conjunction with the older Ragged Mountain Reservoir, with water transferred between the two via a pipeline to optimize storage and maintain supply during periods of drought, as outlined in the community's adopted Water Supply Plan.

Water Supply and Management

As the principal water source for the Rivanna Water & Sewer Authority, the reservoir provides potable water for over 100,000 residents in Charlottesville and parts of Albemarle County. Water is treated at the nearby Observatory Water Treatment Plant before distribution. Management is guided by a long-term Water Supply Plan developed in coordination with the Virginia Department of Environmental Quality and the U.S. Army Corps of Engineers. Operations focus on maintaining safe yield, ensuring compliance with regulations from the Environmental Protection Agency, and implementing conservation measures. The authority also manages the interconnected system with Ragged Mountain Reservoir to enhance reliability and respond to challenges like sedimentation and climate variability.

Recreation and Public Access

Public access to the reservoir is controlled to protect water quality, with recreational activities primarily centered on non-motorized boating and fishing. The Rivanna Water & Sewer Authority permits limited use, such as rowing by the University of Virginia crew teams and access for authorized fishing tournaments. A public boat launch is not available, and swimming is prohibited. Nearby, the broader community enjoys extensive trail networks managed by the Ivy Creek Foundation and the Albemarle County Parks and Recreation department, though these are generally not directly adjacent to the reservoir's shores. The focus remains on preserving the reservoir's primary function as a protected drinking water source.

Environmental Considerations

The reservoir's management includes active measures to protect watershed health and water quality. The Rivanna Water & Sewer Authority implements programs to control erosion, manage riparian buffers, and monitor for contaminants in collaboration with the Virginia Department of Environmental Quality. Invasive species management, particularly for plants like Hydrilla, is an ongoing concern. The authority's operations must balance water supply needs with environmental flow requirements for the Rivanna River ecosystem downstream, as overseen by state regulators. Sedimentation studies and land conservation partnerships with entities like the Thomas Jefferson Soil and Water Conservation District are key components of long-term stewardship efforts for this critical regional resource. Category:Reservoirs in Virginia Category:Albemarle County, Virginia Category:Charlottesville, Virginia