Left Hand
Left Hand is an earth dam located in Boulder County, Colorado, built in 1900. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Left Hand
The primary purpose of Left Hand is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Boulder County Parks And Open Space (alexander, Ro (local government). It impounds the Dry Creek-tr near Longmont.
The dam stands 13 feet tall and stretches 600 feet across, creates a reservoir covering 13 acres, has a maximum storage capacity of 78 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1900, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 09/26/2013. That was over 12 years ago.
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Location
| State | Colorado |
| County | Boulder |
| Nearest City | Longmont |
| River/Stream | Dry Creek-tr |
| Coordinates | 40.12668, -105.19557 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 10 ft |
| Dam Length | 600 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 78 acre-ft |
| Max Storage | 78 acre-ft |
| Normal Storage | 25 acre-ft |
| Surface Area | 13 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 42 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Irrigation |
| Owner | BOULDER COUNTY PARKS AND OPEN SPACE (ALEXANDER, RO |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/26/2013 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO02270 |
| Federal ID | CO02270 |
| More Info | State Dam Safety Program |