| Location ID | Location Name | Type | Latitude | Longitude | MaxDepth | Last Year Collected |
| GYS004 | Grays Harbor - Chehalis River | Rotating | 46.9783354271724 | -123.7833149718 | 15 m | 2014 |
| GYS008 | Grays Harbor - Mid-South Channel | Core | 46.9383354112703 | -123.911714981932 | 5 m | 2017 |
| GYS009 | Grays Harbor - Moon Island Reach | Rotating | 46.9650054086044 | -123.948314993615 | 13 m | 2008 |
| GYS015 | Grays Harbor - North Whitcomb Flats | Rotating | 46.9233353928191 | -124.075015002985 | 13 m | 2008 |
| GYS016 | Grays Harbor - Damon Point | Core | 46.9533353924603 | -124.091715012429 | 9 m | 2017 |