Magoon No. 1
Magoon No. 1 is an earth dam located in Niobrara County, Wyoming, built in 1959. It carries a Low hazard potential classification and has a fair condition assessment.
About Magoon No. 1
The primary purpose of Magoon No. 1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Karen Kay Sides (private). It impounds the Young Woman Creek near Edgemont, Sd.
The dam stands 25 feet tall and stretches 508 feet across, creates a reservoir covering 39 acres, and has a maximum storage capacity of 593 acre-feet. Completed in 1959, 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 07/31/2020.
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Location
| State | Wyoming |
| County | Niobrara |
| Nearest City | Edgemont, Sd |
| River/Stream | Young Woman Creek |
| Coordinates | 42.93000, -104.55000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 508 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 593 acre-ft |
| Max Storage | 593 acre-ft |
| Normal Storage | 358 acre-ft |
| Surface Area | 39 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | KAREN KAY SIDES |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 07/31/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00615 |
| Federal ID | WY00615 |
| More Info | State Dam Safety Program |