Rock Rapids Milldam
Low HazardNot Rated ConditionEmergency Action Plan: Not Required
Location
| State | Iowa |
| County | Lyon |
| Nearest City | ROCK RAPIDS |
| River/Stream | ROCK RIVER |
| Coordinates | 43.43700, -96.16690 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 220 ft |
| Year Completed | 1931 (95 years old) |
Storage & Hydraulics
| NID Storage | 75 acre-ft |
| Max Storage | 75 acre-ft |
| Normal Storage | 49 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 777 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Rock Rapids |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 10/18/1989 |
| Emergency Action Plan | Not Required |