Nelson #1 is an earth dam located in McCone County, Montana, built in 1960. It carries a Significant hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 1,500 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Nelson #1
The primary purpose of Nelson #1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Lyle E Nelson (private). It impounds the Anderson Creek.
The dam stands 20 feet tall and stretches 1,500 feet across, has a maximum storage capacity of 443 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1960, the structure is well into its service life at over 50 years old.
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.
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Location
| State | Montana |
| County | McCone |
| Nearest City | None |
| River/Stream | Anderson Creek |
| Coordinates | 47.78140, -106.13860 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 1,500 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 443 acre-ft |
| Max Storage | 443 acre-ft |
| Normal Storage | 227 acre-ft |
| Drainage Area | 3 sq mi |
| Max Discharge | 800 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Lyle E Nelson |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01552 |
| Federal ID | MT01552 |
| More Info | State Dam Safety Program |