Ish #3 (east Dam)
Ish #3 (east Dam) is an earth dam located in Boulder County, Colorado. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Ish #3 (east Dam)
The primary purpose of Ish #3 (east Dam) is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by The Ish Reservoir Company (private). It impounds the Little Thompson River-os near Milliken.
The dam stands 12 feet tall and stretches 2,760 feet across, creates a reservoir covering 314 acres, has a maximum storage capacity of 9,065 acre-feet, and collects water from a drainage area of 1 square miles.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 07/10/2020.
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Location
| State | Colorado |
| County | Boulder |
| Nearest City | Milliken |
| River/Stream | Little Thompson River-os |
| Coordinates | 40.25360, -105.08168 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 2,760 ft |
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 | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/10/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO02831 |
| Federal ID | CO02831 |
| More Info | State Dam Safety Program |