O'connell Dam is an earth dam located in Haakon County, South Dakota, built in 1999. It carries a Significant hazard potential classification.
Dam profile
NID height · 32 ft32 ft tall and 200 ft long, taller than 74% 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 O'connell Dam
The primary purpose of O'connell 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 O'connell Const. Inc (private). It impounds the Bad River-tr near Philip.
The dam stands 32 feet tall and stretches 200 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 71 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1999, the structure is 27 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.
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Location
| State | South Dakota |
| County | Haakon |
| Nearest City | Philip |
| River/Stream | Bad River-tr |
| Coordinates | 44.03178, -101.68506 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 200 ft |
| Year Completed | 1999 (27 years old) |
Storage & Hydraulics
| NID Storage | 71 acre-ft |
| Max Storage | 71 acre-ft |
| Normal Storage | 34 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,150 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | O'connell Const. Inc |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02443 |
| Federal ID | SD02443 |
| More Info | State Dam Safety Program |