| distance | reference number | name | latitude | longitude |
| 555.7 | 3048 | Tchefuncta River, Lake Pontchartrain, Louisiana | 30.3783 | -90.16 |
| 562.0 | 1702 | Lower Bryant Landing, Tensay River, Alabama | 30.9783 | -87.8733 |
| 563.3 | 1579 | Lake Charles, Calcasieu River, Louisiana | 30.225 | -93.2217 |
| 566.2 | 2597 | Route 433, Bayou BonFouca, Louisiana | 30.2717 | -89.7933 |
| 569.6 | 184 | Bay Waveland Yacht Club, Bay St. Louis, Mississippi | 30.325 | -89.325 |
| 569.6 | 2922 | St. Louis Bay entrance, Mississippi | 30.325 | -89.325 |
| 569.8 | 1705 | Lower Hall Landing, Tensaw River, Alabama | 30.8167 | -87.9167 |
| 570.3 | 2209 | Pearlington, Pearl River, Louisiana | 30.24 | -89.615 |
| 571.5 | 3279 | Waveland, Mississipi Sound, Mississippi | 30.2817 | -89.3667 |
| 571.5 | 3280 | Waveland, Mississippi | 30.2817 | -89.3667 |
| 571.5 | 1182 | Gulfport, Gulfport Harbor, Mississippi | 30.36 | -89.0817 |
| 571.6 | 258 | Biloxi, Biloxi Bay, Mississippi | 30.4117 | -88.9033 |
| 572.8 | 1859 | Mobile (Mobile State Docks), Alabama | 30.7083 | -88.0433 |
| 573.1 | 853 | East Bank 1, Norco, Bayou Labranche, Louisiana | 30.05 | -90.3683 |
| 573.7 | 257 | Biloxi (Cadet Point), Biloxi Bay, Mississippi | 30.39 | -88.8567 |
| 574.7 | 2096 | Ocean Springs, Mississippi | 30.3917 | -88.7983 |
| 576.2 | 2129 | Orange (Old Navy Base), Texas | 30.0983 | -93.7217 |
| 576.9 | 1968 | New Canal USCG station, Lake Pontchartrain, Louisia | 30.0267 | -90.1133 |
| 576.9 | 1969 | New Canal USCG station, Lake Pontchartrain, Louisia | 30.0267 | -90.1133 |
| 578.2 | 530 | Chef Menteur, Chef Menteur Pass, Louisiana | 30.065 | -89.8 |
| 578.3 | 481 | Cat Island, Mississippi | 30.2317 | -89.1167 |
| 580.0 | 1823 | Michoud Substation, ICWW, Louisiana | 30.0067 | -89.9367 |
| 580.5 | 2186 | Paris Road Bridge, Mississippi River Delta, Louisia | 30 | -89.9333 |
| 581.1 | 2193 | Pascagoula NOAA Lab, Pascagoula River, Mississippi | 30.3583 | -88.5667 |
| 582.0 | 2321 | Point of Pines, Bayou Cumbest, Mississippi | 30.3867 | -88.44 |