Porter Moss Agate Dam is an earth dam located in Fall River County, South Dakota, built in 1940. It carries a Low hazard potential classification.
Dam profile
NID height · 18 ft18 ft tall and 550 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 Porter Moss Agate Dam
The primary purpose of Porter Moss 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 Everett Porter (private). It impounds the Moss Agate Creek.
The dam stands 18 feet tall and stretches 550 feet across, and has a maximum storage capacity of 144 acre-feet. Completed in 1940, 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.
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Location
| State | South Dakota |
| County | Fall River |
| Nearest City | None |
| River/Stream | Moss Agate Creek |
| Coordinates | 43.37074, -103.96401 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 550 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 144 acre-ft |
| Max Storage | 144 acre-ft |
| Normal Storage | 120 acre-ft |
| Max Discharge | 1,440 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Everett Porter |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01163 |
| Federal ID | SD01163 |
| More Info | State Dam Safety Program |