Dd No 21 is an earth dam located in Pottawatomie County, Kansas, built in 2009. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 42 ft42 ft tall and 680 ft long, taller than 88% of U.S. dams with a recorded height. 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 21
The primary purpose of Dd No 21 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 Rock Creek Wd No 45 (local government). It impounds the Wilson Creek - Tr.
The dam stands 42 feet tall and stretches 680 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 691 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 2009, the structure is relatively new.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 08/24/2021.
At 42 feet, this dam is taller than 88% of dams nationwide.
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Location
| State | Kansas |
| County | Pottawatomie |
| River/Stream | Wilson Creek - Tr |
| Coordinates | 39.43921, -96.44924 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 42 ft |
| Dam Height | 42 ft |
| Dam Length | 680 ft |
| Year Completed | 2009 (17 years old) |
Storage & Hydraulics
| NID Storage | 691 acre-ft |
| Max Storage | 691 acre-ft |
| Normal Storage | 76 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 1,130 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Rock Creek Wd No 45 |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 08/24/2021 |
| Emergency Action Plan | No |
Identifiers
| NID ID | KS09328 |
| Federal ID | KS09328 |
| More Info | State Dam Safety Program |