Semm Grade Stabilization Dam is an earth dam located in Johnson County, Nebraska, built in 1994. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 31 ft31 ft tall and 639 ft long, taller than 72% 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 Semm Grade Stabilization Dam
Semm Grade Stabilization Dam is a dam in Johnson, Nebraska. The dam is owned by Loren G & Susan E Johnson (private). It impounds the Tr-turkey Creek near Cook.
The dam stands 31 feet tall and stretches 639 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 178 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1994, the structure is 32 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 06/14/2021.
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Location
| State | Nebraska |
| County | Johnson |
| Nearest City | Cook |
| River/Stream | Tr-turkey Creek |
| Coordinates | 40.45768, -96.25854 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 27 ft |
| Dam Length | 639 ft |
| Year Completed | 1994 (32 years old) |
Storage & Hydraulics
| NID Storage | 178 acre-ft |
| Max Storage | 178 acre-ft |
| Normal Storage | 21 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 256 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Loren G & Susan E Johnson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 06/14/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE02473 |
| Federal ID | NE02473 |
| More Info | State Dam Safety Program |