Reservoirs

Existing Facilities > Reservoirs

The district currently owns and operates five reservoirs and has plans to construct more in the future. Combined, the existing reservoirs have the capacity to store in excess of 100,000 acre feet (nearly 33 trillion gallons) of surface water.

The primary function of the reservoirs is to supply culinary and secondary water for Washington County’s residents, but they offer countless recreational, environmental, financial and social benefits as well.

Sand Hollow Reservoir

  • 51,360 acre feet storage capacity
  • Off-stream reservoir
  • Stores water from the Virgin River
  • Completed in 2002
  • Cost $37.3 million


Sand Hollow Reservoir is uniquely located on a natural Navajo sandstone aquifer with an underground storage capacity in excess of 300,000 acre feet. Approximately 4,500 to 11,000 acre feet seep into this underground storage area annually.

In 2003, the 20,000-acre Sand Hollow State Park opened to the public and is one of the state’s most visited destinations, generating millions of dollars in state revenues annually. The park allows ample opportunities for a wide variety of aquatic recreation, including swimming, skiing, boating and fishing as well as scenic terrain for cyclists, off road vehicle riders and equestrians.

Visit www.Utah.com or call 435.680.0715 for information on the state park and recreational opportunities.

Quail Creek Reservoir

  • 40,325 acre feet storage capacity
  • Off-stream reservoir
  • Stores water from the Virgin River
  • Completed in 1984
  • Cost $23.5 million


Quail Creek Reservoir was the first storage project to provide for culinary water deliveries.

One year after its completion, the reservoir opened to the public as a state park. It is a popular boating, camping and fishing area – generating millions in state revenues annually.

Visit www.Utah.com or call 435.879.2378 for information on the state park and recreational opportunities.

Gunlock Reservoir

  • 10,884 acre foot capacity
  • On-stream reservoir
  • Stores water from the Santa Clara River, a tributary of the Virgin River
  • Completed in 1970


Gunlock reservoir was developed by irrigation companies for agriculture needs and is still used today as a secondary water source. The site remains one of Utah’s most quaint reservoirs and state parks, offering 549-acres of open space for boating, fishing and primitive camping opportunities.

Visit www.Utah.com or call 435.680.0715 for information on the state park and recreational opportunities.

Kolob Reservoir

  • 5,586 acre foot capacity
  • Off-stream reservoir
  • Stores water collected in the Virgin River watershed
  • Completed in 1956


The district purchased the reservoir and adjacent land in 1995. A recreational plan was developed in 1996 making the area a popular seasonal destination for boaters, fishers, campers, hikers, photographers and other outdoor recreational enthusiasts.

Ivins Reservoir

  • 778 acre foot capacity
  • Off-stream reservoir
  • Stores water from the Santa Clara River, a tributary of the Virgin River
  • Completed in 1918


Ivins reservoir was built by the early Mormon settlers and is used primarily for irrigation. The reservoir is a scenic spot for boating, fishing and enjoying wildlife habitat. It stores water as part of the Santa Clara Project Agreement.