|Location||Park County, Colorado|
|Basin countries||United States|
|Surface area||2,500 acres (1,000 ha)|
|Water volume||20,000 acre⋅ft (25,000,000 m3)|
|Surface elevation||8,942 ft (2,726 m)|
Antero Reservoir is a reservoir in the US state of Colorado. It was created by the first dam placed on the South Platte River in Park County, central Colorado. It is owned by Denver Water and supplies drinking water to the greater Denver metro region almost 140 miles (230 km) away.
Built in 1909, the earthen dam sat on a site believed by geologists to be a dry lake bed some 300 years old. This lake, named Green Lake, lies submerged in Antero Reservoir.
The Reservoir was closed in 2002 for five years due to drought. The lake went completely dry, and the Colorado Division of Wildlife, in concert with Denver Water resurrected it in 2007. The Colorado Division of Wildlife re-stocked the lake with rainbow trout, brook trout, cutbow, cutthroat trout, brown trout, and splake.
Beginning in May 2013, Antero reservoir was planned to have been drained because of drought conditions. It was not drained because of substantial snowfall in April 2013. In 2013, a $17 million project to rehabilitate the dam began. The reservoir was then expected to be drained in 2015 for necessary repairs, with re-filling in 2016. In the event, Denver Water began to empty the reservoir in June 2015 for "significant repairs to Antero Dam". 
The shallowness of this reservoir makes it relatively warm for the location and altitude. This makes for exceptionally large, fast growing fish. Antero Reservoir is owned by Denver Water and overseen by Colorado Parks and Wildlife. Because it is not a state park, there are no fees for entry. Fishing is year-round, with ice fishing in the winter. A valid fishing license is required.
Elevation: 8,942 feet (2,726 m), Capacity: 20,000 acre⋅ft (25,000,000 m3), Surface area: 2,500 acres (1,000 ha).
- "Antero Reservoir". denverwater.org. Archived from the original on 2013-01-14. Retrieved 2009-11-19.
- A look back in time: Antero Reservoir. WaterNews (Report). Denver Water. August 2015.
The drained water was either recaptured in a downstream reservoir or sent directly to a water treatment plant.
- Pankratz, Howard (23 April 2011). "Water levels at leaking Antero reservoir to be drawn down". Denver Post. Retrieved 23 April 2011. CS1 maint: discouraged parameter (link)
- "Denver Water". denverwater.org. Archived from the original on 2013-04-09. Retrieved 2013-03-25.
- "Archived copy". Archived from the original on 2013-04-28. Retrieved 2013-04-27. CS1 maint: discouraged parameter (link) CS1 maint: archived copy as title (link)
- "Antero Reservoir to be drained for dam rehabilitation work". Pikes Peak Television, Inc. Associated Press. 8 January 2015. Retrieved 9 January 2015. CS1 maint: discouraged parameter (link)
- "Archived copy". Archived from the original on 2010-06-08. Retrieved 2009-11-19. CS1 maint: discouraged parameter (link) CS1 maint: archived copy as title (link)
- "Antero Reservoir - Fairplay, Colorado - Fishing Report & Map by Fish Explorer". fishexplorer.com.