Dd No 2 (blackstone) is an earth dam located in Butler County, Kansas, built in 1981. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 2,000 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 Dd No 2 (blackstone)
The primary purpose of Dd No 2 (blackstone) is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Upper Walnut Wjd No 33 (local government). It impounds the West Branch Walnut River-tr near El Dorado.
The dam stands 20 feet tall and stretches 2,000 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 741 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1981, the structure is 45 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 | Kansas |
| County | Butler |
| Nearest City | El Dorado |
| River/Stream | West Branch Walnut River-tr |
| Coordinates | 37.97816, -96.87867 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 2,000 ft |
| Year Completed | 1981 (45 years old) |
Storage & Hydraulics
| NID Storage | 741 acre-ft |
| Max Storage | 741 acre-ft |
| Normal Storage | 38 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,334 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Upper Walnut Wjd No 33 |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | KS07079 |
| Federal ID | KS07079 |
| More Info | State Dam Safety Program |