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Mayfield Plunge Pool Barrier, located in Lewis County, Washington, is a public utility structure designed and managed by the Federal Energy Regulatory Commission (FERC).
This dam, completed in 1963, serves a unique purpose and stands at a height of 14 feet with a length of 200 feet. The barrier's primary function is to regulate the flow of the Cowlitz River, with a maximum discharge capacity of 313,000 cubic feet per second.
With a storage capacity of 60 acre-feet and a surface area of 2.08 acres, the Mayfield Plunge Pool Barrier plays a crucial role in managing water resources in the region. Despite its low hazard potential, the dam is subject to regular inspections by FERC, with the last assessment conducted in July 2019. Additionally, the barrier has an emergency action plan in place, although its condition assessment is currently marked as 'Not Available'. Overall, the Mayfield Plunge Pool Barrier serves as a vital infrastructure for water resource management in the area, ensuring the safety and functionality of the surrounding environment.
Year Completed |
1963 |
Dam Length |
200 |
Dam Height |
14 |
River Or Stream |
Cowlitz River |
Surface Area |
2.08 |
Hydraulic Height |
14 |
Drainage Area |
1392 |
Nid Storage |
60 |
Structural Height |
14 |
Hazard Potential |
Low |
Nid Height |
14 |
| Location | Reservations | Toilets |
|---|---|---|
Mayfield Lake - Tacoma Power
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Ike Kinswa State Park
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Mossyrock Park - Tacoma Power
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Main Campground
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Kid Valley Campground
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S'mores Loop
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Headwaters In Sw1/4 Sec 28, T9N, R5E To Mount St. Helens National Volcanic Monument Boundary
Mount St. Helens National Volcanic Monument Boundary To Mount St. Helens National Volcanic Boundary In Sw 1/4 Of Sec 32, T11N, R5E
Mount St. Helens National Volcanic Monument Boundary To To Point River Reenters Mshnvm In Se 1/4 Of Sec 11, T10N, R5E
Goat Rocks Wilderness Bounday To Cowlitz Falls Ferc Project Boundary In Ne1/4 Of Nw1/4 Of Sec 4, T11N, R6E
Headwaters In Se1/4 Of Sec 31, T10N, R6E To Mount St. Helens National Volcanic Monument Boundary
(Upper Muddy Segment) Headwaters In Se1/4 Of Sec 10, T8N, R5E To Conflence With Smith Creek