Hill Annex Dike 1

Snowball Creek-OS· Itasca, Minnesota· Built 1920· Earth· 65 ft tall
Low Hazard Tailings Private

Key Takeaway

Hill Annex Dike 1 is classified as low hazard in Minnesota. It was completed in 1920 and is 106 years old. Its primary use is tailings.

Physical Details

Dam Height 65 ft (taller than 98.3% in MN)
Dam Length1,500 ft
Dam TypeEarth
Max Storage910 acre-ft
Normal Storage910 acre-ft
Drainage Area1 sq mi
Year Completed1920 (106 years old)
Year Modified2004
NID IDMN00784

Safety Information

Low Hazard

No probable loss of human life and low economic/environmental losses expected.

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

Emergency Action Plan: No
Last Inspection: October 4, 2023
State Regulated: Yes
Regulatory Agency: MNDNR EWR

Ownership

MNDNR

Private

Nearby Dams

Hill Annex Dike 3

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Significant Hazard 63 ft

Charter

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Essar Steel Tailings Basin

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Significant Hazard 200 ft

Essar Steel Reclaim Pond

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Low Hazard 70 ft

Butler Taconite Initial Tailings

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Unknown 18 ft

Plummer Basin East Tailings

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Low Hazard 50 ft

O'Brien North

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Significant Hazard 49 ft

Reservoir No. 2

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Significant Hazard 33 ft

Frequently Asked Questions

What is the hazard classification of Hill Annex Dike 1?

Hill Annex Dike 1 is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Hill Annex Dike 1?

Hill Annex Dike 1 is owned by MNDNR (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Hill Annex Dike 1 built?

Hill Annex Dike 1 was completed in 1920, making it 106 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 Hill Annex Dike 1?

Hill Annex Dike 1 serves the following purposes: Tailings. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Hill Annex Dike 1?

Hill Annex Dike 1 has a dam height of 65 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 Hill Annex Dike 1 last inspected?

Hill Annex Dike 1 was last inspected on October 4, 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.