Ish #3 (main Dam)
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| State | Colorado |
| County | Larimer |
| Nearest City | BERTHOUD |
| River/Stream | BIG THOMPSON RIVER-OS |
| Coordinates | 40.26309, -105.09555 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 48 ft |
| Dam Height | 42 ft |
| Dam Length | 6,700 ft |
| Year Completed | 1905 (121 years old) |
Storage & Hydraulics
| NID Storage | 9,065 acre-ft |
| Max Storage | 9,065 acre-ft |
| Normal Storage | 7,128 acre-ft |
| Surface Area | 314 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 3,066 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | THE ISH RESERVOIR COMPANY |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/20/2022 |
| Emergency Action Plan | Yes |