Second Millpond Dam

GREEN SWAMP· Sumter, South Carolina· Built 1900· 17 ft tall
High Hazard Recreation Local Government

Key Takeaway

Second Millpond Dam is classified as high hazard in South Carolina. It was completed in 1900 and is 126 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 Height 17 ft (taller than 33.8% in SC)
Max Storage4.0K acre-ft
Normal Storage1.5K acre-ft
Surface Area207 acres
Year Completed1900 (126 years old)
NID IDSC01424

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: June 20, 2023
State Regulated: Yes
Regulatory Agency: SC DHEC

Ownership

SUMTER COUNTY

Local Government

Nearby Dams

Swan Lake Dam

Sumter, SC

Low Hazard 12 ft

Lower Deerfield Lake Dam

Sumter, SC

Significant Hazard 14 ft

Upper Deerfield Lake Dam

Sumter, SC

Significant Hazard 11 ft

Mathis Pond Dam

Sumter, SC

Significant Hazard 12 ft

Loring Millpond Dam

Sumter, SC

Significant Hazard 10 ft

Sawmill Pond Dam

Sumter, SC

Low Hazard 11 ft

Burns Pond Dam

Sumter, SC

Low Hazard 15 ft

Cains Millpond Dam

Sumter, SC

Significant Hazard 9 ft

Frequently Asked Questions

What is the hazard classification of Second Millpond Dam?

Second Millpond 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 Second Millpond Dam?

Second Millpond Dam is owned by SUMTER COUNTY (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Second Millpond Dam built?

Second Millpond Dam was completed in 1900, making it 126 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 Second Millpond Dam?

Second Millpond 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 Second Millpond Dam?

Second Millpond Dam has a dam height of 17 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 Second Millpond Dam last inspected?

Second Millpond Dam was last inspected on June 20, 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.