Iwan #4
Low Hazard ConditionEmergency Action Plan: Not Required
Location
| State | South Dakota |
| County | Mellette |
| Nearest City | NONE |
| River/Stream | TRIB BIG WHITE OFFSTREAM |
| Coordinates | 43.80833, -101.08499 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 497 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 33 acre-ft |
| Max Storage | 33 acre-ft |
| Normal Storage | 29 acre-ft |
| Max Discharge | 2,035 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | IWAN |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |