Antilon Lake Dam, located in Manson, Washington, is a public utility dam primarily used for recreation purposes.
Wind
Humidity
Completed in 1913, this earth dam stands at a hydraulic height of 62 feet, with a structural height and NID height also at 62 feet. The dam has a length of 300 feet and a storage capacity of 2475 acre-feet, providing ample space for recreational activities on its 118-acre surface area.
Managed by the Washington Department of Ecology, Antilon Lake Dam is state-regulated and inspected regularly to ensure its safety and satisfactory condition. With a high hazard potential, the dam is equipped with emergency action plans to mitigate any risk of failure. The last inspection in November 2018 deemed the dam to be in satisfactory condition, with an inspection frequency of every 5 years. In case of an emergency, the dam is equipped with updated emergency contacts and guidelines to meet safety standards.
The dam's location along Tr-Johnson Creek in Chelan County, Washington, makes it a vital water resource for the region. With a maximum discharge of 360 cubic feet per second, the dam plays a crucial role in managing water flow and storage in the area. As a popular spot for outdoor enthusiasts, Antilon Lake Dam serves as a recreational oasis while also serving as a critical infrastructure for water resource management in the region.
Year Completed |
1913 |
Dam Length |
300 |
River Or Stream |
Tr-Johnson Creek |
Primary Dam Type |
Earth |
Surface Area |
118 |
Hydraulic Height |
62 |
Drainage Area |
2.46 |
Nid Storage |
2475 |
Structural Height |
62 |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
62 |
Methow River Near Pateros
|
7840cfs |
Chelan River At Chelan
|
724cfs |
Entiat River Near Ardenvoir
|
1850cfs |
Mad River At Ardenvoir
|
368cfs |
Entiat River Near Entiat
|
1950cfs |
Chiwawa River Near Plain
|
2820cfs |
| Location | Reservations | Toilets |
|---|---|---|
Antilon Lake
|
||
Antilon Lake Campground
|
||
Mitchell Creek
|
||
Mitchell Creek Campground
|
||
Twenty - Five Mile Creek State Park
|
||
Snowberry
|