Timberlakes Dam

Tr-Campbell Creek· Mason, Washington· Built 1968· Earth·
High Hazard Recreation Private

Key Takeaway

Timberlakes Dam is classified as high hazard in Washington. It was completed in 1968 and is 58 years old. Its primary use is recreation. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.

Physical Details

Dam Length205 ft
Dam TypeEarth
Max Storage904 acre-ft
Normal Storage828 acre-ft
Surface Area15 acres
Drainage Area2 sq mi
Max Discharge404 cfs
Year Completed1968 (58 years old)
NID IDWA00089

Safety Information

High Hazard

Loss of human life is likely if the dam fails.

Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?

Emergency Action Plan: Yes
Last Inspection: July 3, 2023
State Regulated: Yes
Regulatory Agency: Washington Dept of Ecology

Ownership

Timberlake Community Club

Private

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Cranberry Lake Stormwater Detention Dam

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Trask Lake Dam

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North Ranch Storage Lagoon

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Whiteman Cove Dam

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Frequently Asked Questions

What is the hazard classification of Timberlakes Dam?

Timberlakes Dam is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Timberlakes Dam?

Timberlakes Dam is owned by Timberlake Community Club (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Timberlakes Dam built?

Timberlakes Dam was completed in 1968, making it 58 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.

What is the primary purpose of Timberlakes Dam?

Timberlakes Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

When was Timberlakes Dam last inspected?

Timberlakes Dam was last inspected on July 3, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.

Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.