Agate Dam is an earth dam located in Sioux County, Nebraska, built in 1936. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 20 ft20 ft tall and 696 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 Agate Dam
The primary purpose of Agate Dam is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by United Ss Forest Service (federal). It impounds the Tr-long Branch Creek near Ardmore Sd.
The dam stands 20 feet tall and stretches 696 feet across, creates a reservoir covering 13 acres, has a maximum storage capacity of 205 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1936, the structure is well-established, with more than 75 years of service.
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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 08/06/2019.
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Location
| State | Nebraska |
| County | Sioux |
| Nearest City | Ardmore Sd |
| River/Stream | Tr-long Branch Creek |
| Coordinates | 42.95342, -103.51673 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 696 ft |
| Year Completed | 1936 (90 years old) |
Storage & Hydraulics
| NID Storage | 205 acre-ft |
| Max Storage | 205 acre-ft |
| Normal Storage | 67 acre-ft |
| Surface Area | 13 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 5,800 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | United Ss Forest Service |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 08/06/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE01397 |
| Federal ID | NE01397 |
| More Info | State Dam Safety Program |