D.F. Riley Grist Mill Dam
Key Takeaway
D.F. Riley Grist Mill Dam is classified as significant hazard in Massachusetts. It was completed in 1881 and is 145 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 19 ft (taller than 67.3% in MA) |
| Dam Length | 200 ft |
| Dam Type | Masonry |
| Max Storage | 580 acre-ft |
| Normal Storage | 290 acre-ft |
| Surface Area | 0 acres |
| Drainage Area | 48 sq mi |
| Year Completed | 1881 (145 years old) |
| NID ID | MA00493 |
Safety Information
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?
Ownership
MILL RIVER STORAGE, LLC
Private
Nearby Dams
Lake Warner Dam
Hampshire, MA
Significant Hazard 17 ftFitzgerald Dam
Hampshire, MA
Low Hazard 22 ftParadise Pond Dam
Hampshire, MA
High Hazard 29 ftMountain Street Reservoir Dikes
Hampshire, MA
Low Hazard 16 ftMountain Street Reservoir Dam
Hampshire, MA
High Hazard 33 ftMill River Dam
Hampshire, MA
Significant Hazard 40 ftVistron Dam
Hampshire, MA
Significant Hazard 25 ftRocky Hill Pond Dam
Hampshire, MA
Low Hazard 26 ftFrequently Asked Questions
What is the hazard classification of D.F. Riley Grist Mill Dam?
D.F. Riley Grist Mill 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 D.F. Riley Grist Mill Dam?
D.F. Riley Grist Mill Dam is owned by MILL RIVER STORAGE, LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was D.F. Riley Grist Mill Dam built?
D.F. Riley Grist Mill Dam was completed in 1881, making it 145 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 D.F. Riley Grist Mill Dam?
D.F. Riley Grist Mill 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 D.F. Riley Grist Mill Dam?
D.F. Riley Grist Mill Dam has a dam height of 19 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 D.F. Riley Grist Mill Dam last inspected?
D.F. Riley Grist Mill Dam was last inspected on May 31, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.