North Oak Creek 1-a
North Oak Creek 1-a is an earth dam located in Lancaster County, Nebraska, built in 1979. It carries a High hazard potential classification and has a satisfactory condition assessment.
About North Oak Creek 1-a
The primary purpose of North Oak Creek 1-a 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 Lower Platte South Natural Resources District (local government). It impounds the Wagon Tongue Creek near Agnew.
The dam stands 54 feet tall and stretches 1,910 feet across, creates a reservoir covering 107 acres, has a maximum storage capacity of 3,222 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1979, the structure is 47 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/22/2024.
At 54 feet, this dam is taller than 94% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Nebraska dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Nebraska |
| County | Lancaster |
| Nearest City | Agnew |
| River/Stream | Wagon Tongue Creek |
| Coordinates | 41.03409, -96.83709 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 54 ft |
| Dam Height | 48 ft |
| Dam Length | 1,910 ft |
| Year Completed | 1979 (47 years old) |
Storage & Hydraulics
| NID Storage | 3,222 acre-ft |
| Max Storage | 3,222 acre-ft |
| Normal Storage | 948 acre-ft |
| Surface Area | 107 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 4,372 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Lower Platte South Natural Resources District |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/22/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NE01665 |
| Federal ID | NE01665 |
| More Info | State Dam Safety Program |