Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
37618
| NE | Boyd | Niobrara River, below Bristow Dam (Riverside park), 4 miles SW of the town of Bristow | 1928 |
10150007
| Lower Niobrara | established |
37767
| NE | Knox | Lagoon in Niobrara State Park, w of Niobrara, formerly a channel of Niobrara River, near mouth in Missouri River | 1939 |
10150007
| Lower Niobrara | established |
37766
| NE | Knox | Niobrara River, 1 mi w of Niobrara, Niobrara State Park near mouth at Missouri River | 1939 |
10150007
| Lower Niobrara | established |