Backbone Dam
Significant HazardSatisfactory ConditionEmergency Action Plan: Not Required
Location
| State | Iowa |
| County | Delaware |
| Nearest City | DUNDEE |
| River/Stream | MAQUOKETA RIVER |
| Coordinates | 42.60030, -91.53620 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 908 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 1,000 acre-ft |
| Max Storage | 1,000 acre-ft |
| Normal Storage | 600 acre-ft |
| Surface Area | 125 acres |
| Drainage Area | 120 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Iowa Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/16/2024 |
| Emergency Action Plan | Not Required |