Elderly Dam is an earth dam located in Fergus County, Montana, built in 1975. It carries a Significant hazard potential classification.
Dam profile
NID height · 40 ft40 ft tall and 1,300 ft long, taller than 86% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Elderly Dam
The primary purpose of Elderly Dam is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Glen H. & Bette A. Rindal (private). It impounds the Brush Creek near Roy.
The dam stands 40 feet tall and stretches 1,300 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 560 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1975, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life.
At 40 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | Montana |
| County | Fergus |
| Nearest City | Roy |
| River/Stream | Brush Creek |
| Coordinates | 47.32270, -109.03400 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 1,300 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 560 acre-ft |
| Max Storage | 560 acre-ft |
| Normal Storage | 560 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 4 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Glen H. & Bette A. Rindal |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03258 |
| Federal ID | MT03258 |
| More Info | State Dam Safety Program |