Steffen Dam
Steffen Dam is an earth dam located in Knox County, Nebraska, built in 1974. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Steffen Dam
The primary purpose of Steffen Dam 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 Thomas & Donna Steffen Revocable Trust (private). It impounds the Tr-beaver Creek near Sioux City Ia.
The dam stands 27 feet tall and stretches 691 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 255 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1974, 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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 04/21/2020.
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Location
| State | Nebraska |
| County | Knox |
| Nearest City | Sioux City Ia |
| River/Stream | Tr-beaver Creek |
| Coordinates | 42.77839, -97.51266 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 26 ft |
| Dam Length | 691 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 255 acre-ft |
| Max Storage | 255 acre-ft |
| Normal Storage | 13 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 415 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Thomas & Donna Steffen Revocable Trust |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/21/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE01272 |
| Federal ID | NE01272 |
| More Info | State Dam Safety Program |