Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
37430
| NE | Sheridan | just north of Niobrara River (Walgren Lake?) | 1974 |
10150003
| Upper Niobrara | established |
37552
| NE | Sheridan | Walgren Lake, ca 6 mil se of Hay Springs, a disconnected sand hill lake | 1964 |
10150003
| Upper Niobrara | unknown |
37427
| NE | Sheridan | Walgren Lake, ca 6 mil se of Hay Springs, a disconnected sand hill lake | 1974 |
10150003
| Upper Niobrara | established |