USNIC Great Lakes Concentration of Ice and Snow (0)
| Ice Free Water |
| Less than 1/10 (open water) |
| 1/10 - 3/10 (very open ice) |
| 4/10 - 6/10 (open ice) |
| 7/10 - 8/10 (close ice) |
| 9/10 - 10/10 (very close ice) |
| Fast Ice |
| Undetermined / Unknown |
| <all other values> |
USNIC Great Lakes Stage of Development (Thickness) of Ice and Snow (1)
|
| Ice Free Water |
|
| Brash Ice |
|
| No Stage of Development |
| New Ice |
| Nilas, Ice Rind |
| Young Ice |
| Grey Ice |
| Grey - White Ice |
| First Year Ice |
| Thin First Year Ice |
| Thin First Year Stage 1 |
| Thin First Year Stage 2 |
|
| For Later Use |
| Medium First Year Ice |
|
| For Later Use |
| Thick First Year Ice |
| For Later Use |
| Old Ice |
| Second Year Ice |
| Multi-Year Ice |
| Glacier Ice |
|
| Undetermined/Unknown |
|
| <all other values> |
|