Marian Lake Dam

TRIB CEDAR CREEK· Adams, Illinois· Earth· 26 ft tall

High Hazard Recreation Private

Key Takeaway

Marian Lake Dam is classified as high hazard in Illinois. 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 Height	26 ft (taller than 47.1% in IL)
Dam Length	330 ft
Dam Type	Earth
Max Storage	65 acre-ft
Normal Storage	26 acre-ft

Surface Area	4 acres
Drainage Area	0 sq mi
NID ID	IL50611

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: No

Last Inspection: April 27, 2021

State Regulated: Yes

Regulatory Agency: IDNR

Ownership

LAKE MARIAN ASSOCIATION

Private

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East Lake Centre Dam

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Fieldstone Subdivision Twin Dams-South Dam

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Fieldstone Subdivision Twin Dams-North Dam

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Treasure Lake Dam

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Lucinda Lake Dam

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Doyle Lake Dam

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Triangle Lake Dam

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Frequently Asked Questions

What is the hazard classification of Marian Lake Dam?

Marian Lake 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 Marian Lake Dam?

Marian Lake Dam is owned by LAKE MARIAN ASSOCIATION (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of Marian Lake Dam?

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

How tall is Marian Lake Dam?

Marian Lake Dam has a dam height of 26 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.

When was Marian Lake Dam last inspected?

Marian Lake Dam was last inspected on April 27, 2021. 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.