Alkali (nid) is an earth dam located in Lyman County, South Dakota, built in 1938. It carries a Low hazard potential classification.
Dam profile
NID height · 16 ft16 ft tall and 420 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 Alkali (nid)
The primary purpose of Alkali (nid) 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 Usda Fs (federal). It impounds the Dry Draw near Missouri River.
The dam stands 16 feet tall and stretches 420 feet across, has a maximum storage capacity of 75 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1938, 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. The most recent inspection on record was 10/12/2006. That was over 20 years ago.
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Location
| State | South Dakota |
| County | Lyman |
| Nearest City | Missouri River |
| River/Stream | Dry Draw |
| Coordinates | 44.18394, -100.28359 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 420 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 75 acre-ft |
| Max Storage | 75 acre-ft |
| Normal Storage | 75 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 372 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Usda Fs |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/12/2006 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01174 |
| Federal ID | SD01174 |
| More Info | State Dam Safety Program |