Comparison of North Tippah channel sections at sedimentation ranges with nearest sections taken just before and after 1963 channel straightening.
| Date and location | Top width (feet) | Bottom width (feet) | Depth (feet) | Cross section (square feet) | |
|---|---|---|---|---|---|
| 1939 | Range 1 (nr. Sta. 344+00) | 30 | 12 | 8.0 | 195 |
| 1961 | Sta. 345+00 | 43 | 19 | 7.2 | 227 |
| 1964 | Not surveyed-not dredged | - | - | - | - |
| 1969 | Range 1 | 42 | 8 | 13.0 | 355 |
| 1939 | Range 2 (nr. Sta. 269+00) | 65* | 26 | 8.6 | 433 |
| 1961 | Sta. 265+00 | 47 | 20 | 8.7 | 289 |
| 1963 | Sta. 268+00, constr. stakes | 51 | 14 | 8.6 | 229 |
| 1964 | Sta. 265+00, As Built | 36 | 20 | 9.6 | 272 |
| 1969 | Range 2 | 67* | 26 | 9.5 | 493 |
| 1939 | Range 3 (nr. Sta. 147+00) | 47** | 18** | 10.0 | 318 |
| 1962 | Sta. 151+50 | 32 | 13 | 7.4 | 143 |
| 1964 | Sta. 150+00, As Built | 49 | 28 | 10.5 | 403 |
| 1964 | Sta. 145+00, As Built | 48 | 28 | 9.2 | 420 |
| 1969 | Range 3 | 59 | 27 | 12.1 | 570 |
| 1939 | Range 4 (old channel) | 41 | 27 | 10.1 | 305 |
| 1961-1962 | Not surveyed | - | - | - | - |
| 1964 | Sta. 55+00, As Built*** | 54 | 32 | 10.5 | 445 |
| 1969 | Range 4 (nr. Sta. 54+00)*** | 76 | 26 | 11.4 | 670 |
* The greater channel width at Range 2, both in 1939 and 1969, makes it doubtful whether valid comparisons can be made with the nearest available sections taken just before and after channel straightening.
** Width only 37 and 8 feet according to survey notes, but comparison with 1969 survey suggests 10 feet error.
*** New channel.