Union Mill Pond

PASCOAG RIVER· Providence, Rhode Island· Built 1883· Earth· 7 ft tall
Significant Hazard Private

Key Takeaway

Union Mill Pond is classified as significant hazard in Rhode Island. It was completed in 1883 and is 143 years old. Significant hazard means failure could cause economic or environmental damage. Learn more.

Physical Details

Dam Height 7 ft (taller than 8.1% in RI)
Dam Length290 ft
Dam TypeEarth
Max Storage70 acre-ft
Normal Storage45 acre-ft
Surface Area12 acres
Drainage Area9 sq mi
Max Discharge425 cfs
Year Completed1883 (143 years old)
NID IDRI04011

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: Yes
Last Inspection: June 23, 2016
State Regulated: Yes
Regulatory Agency: DS

Ownership

SAYLES MILLS ASSOCIATES

Private

Nearby Dams

Pascoag Reservoir Upper

Providence, RI

High Hazard 27 ft

Ross Pond

Providence, RI

Significant Hazard 6 ft

Wilson Reservoir

Providence, RI

High Hazard 21 ft

Harrisville Pond

Providence, RI

High Hazard 19 ft

Sucker Pond

Providence, RI

Significant Hazard 13 ft

Spring Lake

Providence, RI

Significant Hazard 8 ft

Sucker Brook Bridge Pond

Providence, RI

Significant Hazard 13 ft

Round Top Pond

Providence, RI

Low Hazard 10 ft

Frequently Asked Questions

What is the hazard classification of Union Mill Pond?

Union Mill Pond 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 Union Mill Pond?

Union Mill Pond is owned by SAYLES MILLS ASSOCIATES (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Union Mill Pond built?

Union Mill Pond was completed in 1883, making it 143 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.

How tall is Union Mill Pond?

Union Mill Pond has a dam height of 7 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 Union Mill Pond last inspected?

Union Mill Pond was last inspected on June 23, 2016. 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.