Eastdale #1
Eastdale #1 is an earth dam located in Costilla County, Colorado, built in 1909. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Eastdale #1
The primary purpose of Eastdale #1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Eastdale Mutual Ditch & Reservoir (dean Swift) (private). It impounds the Costilla Creek-tr near Arroya Hondo, Nm.
The dam stands 31 feet tall and stretches 2,175 feet across, creates a reservoir covering 336 acres, has a maximum storage capacity of 5,820 acre-feet, and collects water from a drainage area of 12 square miles. Completed in 1909, 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 10/25/2021.
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Location
| State | Colorado |
| County | Costilla |
| Nearest City | Arroya Hondo, Nm |
| River/Stream | Costilla Creek-tr |
| Coordinates | 37.05094, -105.61862 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 2,175 ft |
| Year Completed | 1909 (117 years old) |
Storage & Hydraulics
| NID Storage | 5,820 acre-ft |
| Max Storage | 5,820 acre-ft |
| Normal Storage | 3,468 acre-ft |
| Surface Area | 336 acres |
| Drainage Area | 12 sq mi |
| Max Discharge | 4,384 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | EASTDALE MUTUAL DITCH & RESERVOIR (DEAN SWIFT) |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/25/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO01900 |
| Federal ID | CO01900 |
| More Info | State Dam Safety Program |