John Alley
Low Hazard ConditionEmergency Action Plan: Not Required
Location
| State | South Dakota |
| County | Jackson |
| Nearest City | NONE |
| River/Stream | TR-BLACK HORSE CREEK |
| Coordinates | 43.50166, -101.64999 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 670 ft |
| Year Completed | 1946 (80 years old) |
Storage & Hydraulics
| NID Storage | 128 acre-ft |
| Max Storage | 128 acre-ft |
| Normal Storage | 51 acre-ft |
| Max Discharge | 4,840 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | ROBERT ALLEY |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |