Ryno #1
Ryno #1 is an earth dam located in Mellette County, South Dakota, built in 1954. It carries a Low hazard potential classification.
About Ryno #1
The primary purpose of Ryno #1 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 Ryno (private). It impounds the Tr White Thunder Cr Offstream.
The dam stands 30 feet tall and stretches 211 feet across, and has a maximum storage capacity of 36 acre-feet. Completed in 1954, 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.
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Location
| State | South Dakota |
| County | Mellette |
| Nearest City | None |
| River/Stream | Tr White Thunder Cr Offstream |
| Coordinates | 43.52999, -100.49999 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 211 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 36 acre-ft |
| Max Storage | 36 acre-ft |
| Normal Storage | 32 acre-ft |
| Max Discharge | 130 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | RYNO |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01415 |
| Federal ID | SD01415 |
| More Info | State Dam Safety Program |