| Middle Fork Broad River WS Str # 6 Banks County | 26 | — | Low | Not Rated |
| Middle Oconee- Walnut Creek Str No 1 Hall County | 47 | 1973 | Low | Not Rated |
| Middle Oconee- Walnut Creek Structure No 7 Hall County | 47 | 1972 | Low | Not Rated |
| Middle Oconee- Walnut Creek Structure No 9 Hall County | 46 | 1972 | Low | Not Rated |
| Middle Oconee-Walnut Creek Watershed No. 3 Hall County | 40 | 1971 | Low | Not Rated |
| Middle Oconee-Walnut Creek WS Str #19 Jackson County | 31 | 1967 | Low | Not Rated |
| Middle Oconee-Walnut Creek WS Structure # 12 Jackson County | 36 | 1969 | Low | Not Rated |
| Middle Oconee-Walnut Creek WS Structure # 15 Jackson County | 36 | — | Low | Not Rated |
| Middle Oconee-Walnut Creek WS Structure # 16 Jackson County | 25 | 1968 | Low | Not Rated |
| Middle Oconee-Walnut Creek WS Structure # 17 Jackson County | 28 | 1968 | Low | Not Rated |
| Middle Oconee-Walnut Creek WS Structure # 18 Jackson County | 35 | 1967 | Low | Not Rated |
| Middle Oconee-Walnut Creek WS Structure # 6 Jackson County | 31 | 1969 | Low | Not Rated |
| Middle Stewart Lake Dam Oconee County | 27 | — | Low | Not Rated |
| Middleton Farm Lake Dam Worth County | 22 | — | Low | Not Rated |
| Mike Cook Lake Dam Monroe County | 15 | — | Undetermined | Not Rated |
| Milams Lake Dam Fulton County | 18 | 1950 | Undetermined | Not Rated |
| Milburne Lake Dam Jenkins County | 15 | 1960 | Low | Not Rated |
| Miles Pond Dam Appling County | 11 | 1977 | Low | Not Rated |
| Miles Pond Dam Burke County | 11 | — | Undetermined | Not Rated |
| Mill Branch Fresh Water Impound Warren County | 23 | 1992 | Low | Not Rated |
| Mill - Canton Creek W/S Str. #10 Dam Cherokee County | 24 | 1968 | High | Poor |
| Mill - Canton Creek W/S Str. #12 Dam Cherokee County | 36 | 1965 | High | Poor |
| Mill - Canton Creek W/S Str. #3 Dam Cherokee County | 33 | 1963 | Low | Not Rated |
| Mill - Canton Creek W/S Str. #4 Dam Cherokee County | 32 | 1964 | Low | Not Rated |
| Mill - Canton Creek W/S Str. #6 Dam Cherokee County | 32 | 1964 | High | Poor |