Sully 2

OAK CREEK -TR· Todd, South Dakota· Built 1935· Earth·
High Hazard Fish And Wildlife Pond Fire Protection Stock Or Small Fish Pond Recreation Federal Government

Key Takeaway

Sully 2 is classified as high hazard in South Dakota. It was completed in 1935 and is 91 years old. Its primary use is fish and wildlife pond. 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 Length496 ft
Dam TypeEarth
Normal Storage200 acre-ft
Year Completed1935 (91 years old)
NID IDSD02562

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: August 7, 2012
State Regulated: No
Regulatory Agency: DENR

Ownership

BIA

Federal Government

Nearby Dams

Paulsen

Todd, SD

Low Hazard 19 ft

South Okreek

Todd, SD

High Hazard

Tower Dam

Todd, SD

Low Hazard 20 ft

Gregg Dam

Todd, SD

Low Hazard 12 ft

Gifford No. 2

Mellette, SD

Low Hazard 27 ft

Gregg Dam No. 2

Todd, SD

Low Hazard 15 ft

Gifford No.1

Mellette, SD

Low Hazard 26 ft

Richtor

Mellette, SD

Low Hazard 40 ft

Frequently Asked Questions

What is the hazard classification of Sully 2?

Sully 2 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 Sully 2?

Sully 2 is owned by BIA (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Sully 2 built?

Sully 2 was completed in 1935, making it 91 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 Sully 2?

Sully 2 serves the following purposes: Fish And Wildlife Pond, Fire Protection, Stock, Or Small Fish Pond, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

When was Sully 2 last inspected?

Sully 2 was last inspected on August 7, 2012. 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.