Iwan O.m. Number 1
Low Hazard ConditionEmergency Action Plan: Not Required
Location
| State | South Dakota |
| County | Mellette |
| Nearest City | NONE |
| River/Stream | TRIB OF WHITE RIVER |
| Coordinates | 43.82166, -101.08499 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 300 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 45 acre-ft |
| Max Storage | 45 acre-ft |
| Normal Storage | 30 acre-ft |
| Max Discharge | 2,100 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | O.M. IWAN |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |