Hankison
Hankison is an earth dam located in Grand County, Colorado, built in 1951. It carries a Low hazard potential classification and has a fair condition assessment.
About Hankison
The primary purpose of Hankison is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Little H O Ranch (stonehocker, Walt & Mike) (private). It impounds the Walden Hollow near Hot Sulphur Springs.
The dam stands 44 feet tall and stretches 450 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 181 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1951, the structure is well into its service life at over 50 years 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 07/20/2021.
At 44 feet, this dam is taller than 90% of dams nationwide.
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Location
| State | Colorado |
| County | Grand |
| Nearest City | Hot Sulphur Springs |
| River/Stream | Walden Hollow |
| Coordinates | 40.10167, -105.84557 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 44 ft |
| Dam Height | 38 ft |
| Dam Length | 450 ft |
| Year Completed | 1951 (75 years old) |
Storage & Hydraulics
| NID Storage | 181 acre-ft |
| Max Storage | 181 acre-ft |
| Normal Storage | 117 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 164 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | LITTLE H O RANCH (STONEHOCKER, WALT & MIKE) |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 07/20/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO00709 |
| Federal ID | CO00709 |
| More Info | State Dam Safety Program |