Relegation and Promotion Formula for U16 teams moving to U17 in 2010. (to be confirmed by CRLMC)
| 2010 | |||||
| U17 | L1 | L3 | L4P | L4D1 | L4D2 |
| 1 | Scarb United | Innisfil | Barrie B | Orillia | |
| 2 | Pickering A | Vaughan A | Richmond Hill | Vaughan B | |
| 3 | Newmarket | East Gwillimbury | Lake Simcoe | Islington | |
| 4 | Unionville Milliken | Darlington | Woodbridge | Cobourg | |
| 5 | Barrie A | Glen Shields | East York | King City | |
| 6 | Aurora | Whitby | Bradford | vacant | |
| 7 | Markham | Pickering B | vacant | vacant | |
| 8 | Peterborough | Bracebridge | vacant | vacant | |
| 9 | |||||
| 10 | |||||
| 11 | |||||
| 12 | CGSL-U16L3-1 |
*If no more teams drop out or apply then L4D1 and D2 may play a crossover schedule
*THESE ARE VERTICAL PLACEMENTS IN DIVISION 1 AND 2.
NO TEAMS ARE RELEGATED AND NEW TEAMS MAY APPLY DIRECTLY TO CGSL.