E-21b is an earth dam located in Jefferson County, Kansas, built in 1958. It carries a Low hazard potential classification.
Dam profile
NID height · 42 ft42 ft tall and 500 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 E-21b
The primary purpose of E-21b 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 Delaware Wjd No 10 (local government). It impounds the Little Slough Creek.
The dam stands 42 feet tall and stretches 500 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 293 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1958, 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. The most recent inspection on record was 07/17/2012. That was over 14 years ago.
At 42 feet, this dam is taller than 88% of dams nationwide.
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Location
| State | Kansas |
| County | Jefferson |
| River/Stream | Little Slough Creek |
| Coordinates | 39.26049, -95.35627 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 42 ft |
| Dam Height | 40 ft |
| Dam Length | 500 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 293 acre-ft |
| Max Storage | 293 acre-ft |
| Normal Storage | 64 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 1,830 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Delaware Wjd No 10 |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/17/2012 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | KS02755 |
| Federal ID | KS02755 |
| More Info | State Dam Safety Program |