Twin Lake Dam

TRIB WOLF BRANCH· St. Clair, Illinois· Earth· 15 ft tall
Significant Hazard Flood Risk Reduction Private

Key Takeaway

Twin Lake Dam is classified as significant hazard in Illinois. Its primary use is flood risk reduction. Significant hazard means failure could cause economic or environmental damage. Learn more.

Physical Details

Dam Height 15 ft (taller than 16.3% in IL)
Dam Length90 ft
Dam TypeEarth
Max Storage30 acre-ft
Normal Storage20 acre-ft
Surface Area15 acres
NID IDIL50599

Safety Information

Significant Hazard

No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.

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

Emergency Action Plan: No
Last Inspection: June 6, 2018
State Regulated: Yes
Regulatory Agency: IDNR

Ownership

MR. & MRS. BECKETT

Private

Nearby Dams

Arenas Dam

St. Clair, IL

Significant Hazard 20 ft

Timber Lake Dam

St. Clair, IL

Significant Hazard 20 ft

Crystal Lake Dam

St. Clair, IL

Significant Hazard 18 ft

St. Clair County Retention Pond 1 Dam

St. Clair, IL

High Hazard 31 ft

Woodfield Lake Estates Dam

St. Clair, IL

High Hazard 15 ft

Lawrence Lake Dam

St. Clair, IL

High Hazard 24 ft

Gebhardt Lake Dam

St. Clair, IL

High Hazard

Heitmans Pond Dam

St. Clair, IL

Significant Hazard 30 ft

Frequently Asked Questions

What is the hazard classification of Twin Lake Dam?

Twin Lake Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Twin Lake Dam?

Twin Lake Dam is owned by MR. & MRS. BECKETT (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of Twin Lake Dam?

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

How tall is Twin Lake Dam?

Twin Lake Dam has a dam height of 15 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 Twin Lake Dam last inspected?

Twin Lake Dam was last inspected on June 6, 2018. 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.