Upper Zone 
              
              
                 | 
                |  Segment Name
               |           
                 | Salinity Regime 
                                  
                 | 
                        | CB1TF
                        1
                         | Northern Chesapeake Bay Segment 1
                         | Tidal Fresh
                 | 
                          | CB1TF
                          2
                           | Northern Chesapeake Bay Segment 2
                           | Tidal Fresh
                 | 
                            | NORTF
                             | Northeast River
                             | Tidal Fresh
                 | 
                              | ELKOH
                              1
                               | Elk River Segment 1
                               | Oligohaline
                 | 
                                | ELKOH
                                2
                                 | Elk River Segment 2 
                                 | Oligohaline
                 | 
                                  | BOHOH
                                   | Bohemia River
                                   | Oligohaline
                 | 
                                    | C&DOH
                                     | Chesapeake & Delaware Canal
                                     | Oligohaline
                 | 
                                      | CB2OH
                                       | Upper Chesapeake Bay
                                       | Oligohaline
                 | 
                                        | SASOH
                                        1
                                         | Sassafras River
                                        Segment 1 
                                         | Oligohaline
                 | 
                    | SASOH
                    2
                     | Sassafras River
                    Segment 2 
                     | Oligohaline
                 | 
                                            | BSHOH
                                             | Bush River
                                             | Oligohaline
                 | 
                                              | GUNOH
                                              1
                                               | Gunpowder River Segment 1 
                                               | Oligohaline
                 | 
                                                | GUNOH 2
                                                 | Gunpowder River Segment 2 
                                                 | Oligohaline
                 | 
                                                  | MIDOH
                                                   | Middle River | Oligohaline
                 | 
                                                    | BACHOH
                                                     | Back River
                                                     | Oligohaline
                 | 
                                                      | CB3MH
                                                       | Upper Central Chesapeake Bay | Mesohaline
                 | 
                                                        | PATMH
                                                         | Patapsco River
                                                         | Mesohaline
                 | 
                                                          | MAGMH
                                                           | Magothy River
                                                           | Mesohaline
                 | 
                                                          | CHSMH
                                                             | Lower Chester River
                                                             | Mesohaline
                   | 
                                                              | CHSOH
                                                               | Middle Chester River
                                                               | Oligohaline
                   | 
                                                                | CHSTF                    
                                                                 | Upper Chester River                    
                                                                 | Tidal Fresh                    
                   | 
                    |                     
                     |                     
                     |                     
                 | 
                                            Middle Zone 
                                            
                                             |                                         
                                             |                                         
                             
                 | 
                                            | Segment Name
                     | 
                   | Salinity Regime                                        
                                                         
                   | 
                                            | CB4MH
                                             | Middle Central Chesapeake Bay
                                             | Mesohaline
                   | 
                                              | EASMH
                                               | Eastern Bay
                                               | Mesohaline
                   | 
                                                | CHOMH1
                                                 | Mouth of the Choptank River
                                                 | Mesohaline
                   | 
                                                  | CHOMH2
                                                   | Lower Choptank River
                                                   | Mesohaline
                   | 
                                                    | CHOOH
                                                     | Middle Choptank River
                                                     | Oligohaline
                   | 
                                                      | CHOTF
                                                       | Upper Choptank River
                                                       | Tidal Fresh
                   | 
                                                        | LCHMH
                                                         | Little Choptank River
                                                         | Mesohaline
                   | 
                                                          | SEVMH
                                                           | Severn River
                                                           | Mesohaline
                   | 
                                                            | SOUMH
                                                             | South River
                                                             | Mesohaline
                   | 
                                                              | RHDMH
                                                               | Rhode River
                                                               | Mesohaline
                   | 
                                                                | WSTMH
                                                                 | West River
                                                                 | Mesohaline
                   | 
                                                                  | CB5MH
                                                                   | Lower Central Chesapeake Bay
                                                                   | Mesohaline
                   | 
                                                                    | HNGMH
                                                                     | Honga River
                                                                     | Mesohaline
                   | 
                                                                      | FSBMH
                                                                       | Fishing Bay
                                                                       | Mesohaline
                   | 
                                                                        | NANMH
                                                                         | Lower Nanticoke River
                                                                         | Mesohaline
                   | 
                                                                          | NANOH
                                                                           | Middle Nanticoke River
                                                                           | Oligohaline
                   | 
                                                                            | NANTF
                                                                             | Upper Nanticoke River
                                                                             | Tidal Fresh
                   | 
                                                                              | WICMH
                                                                               | Wicomico River
                                                                               | Mesohaline
                   | 
                                                                                | TANMH1
                                                                                 | Tangier Sound
                                                                                Segment 1 
                                                                                 | Mesohaline
                   | 
                                                                                  | TANMH
                                                                                  2
                                                                                   | Tangier Sound
                                                                                  Segment 2 
                                                                                   | Mesohaline
                   | 
                                                                                    | MANMH1
                                                                                     | Manokin River Segment 1 
                                                                                     | Mesohaline
                   | 
                                                                                      | MANMH
                                                                                      2
                                                                                       | Manokin River
                                                                                      Segment 2 
                                                                                       | Mesohaline
                   | 
                    | BIGMH
                    1
                     | Big Annemessex River
                    Segment 1 
                     | Mesohaline
                   | 
                    | BIGMH
                    2
                     | Big Annemessex River
                    Segment 2 
                     | Mesohaline
                   | 
                                                                                          | POCMH
                                                                                           | Lower Pocomoke River
                                                                                           | Mesohaline
                   | 
                    | POCOH
                     | Middle  Pocomoke River
                     | Oligohaline                  
                   | 
                                                                                              | POCTF
                                                                                               | Upper Pocomoke River
                                                                                               | Tidal Fresh
                                                                                               | 
                                                                           | 
                                                       | 
                   | 
                    | PAXMH1
                     | Lower Patuxent River Segment 1 
                     | Mesohaline                                                                                                
                   | 
                                                                                                  | PAXMH2
                                                                                                   | Lower Patuxent River Segment 2 
                                                                                                   | Mesohaline                  
                   | 
                    | PAXMH3
                     | Lower Patuxent River Segment 3
                     | Mesohaline                  
                   | 
                    | PAXMH4
                     | Lower Patuxent River Segment 4
                     | Mesohaline                  
                   | 
                    | PAXMH5
                     | Lower Patuxent River Segment 5 
                     | Mesohaline                  
                   | 
                    | PAXMH6
                     | Lower Patuxent River Segment 6 
                     | Mesohaline                  
                   | 
                                                                                                            | PAXOH
                                                                                                             | Middle Patuxent River
                     | Oligohaline
                   | 
                                                                                                              | PAXTF
                                                                                                               | Upper Patuxent River | Tidal Fresh
                   | 
                                                                                                                | WBRTF
                                                                                                                 | Western Branch of the Patuxent River
                                                                                                                 |  Tidal Fresh
                   | 
                    | POTMH
                     | Lower Potomac River
                     |  Mesohaline                  
                   | 
                    | POTOH1
                     | Middle Potomac River Segment 1
                     |  Oligohaline                                                                                  
                   | 
                                                                                    | POTOH2
 | Middle Potomac River Segment 2 
 | Oligohaline
                   | 
                    | POTOH3
                     | Middle Potomac River Segment 3
                     |  Oligohaline                                                                                    
                   | 
                    | POTTF                    
                     | Upper Potomac River                    
                     | Tidal Fresh                    
                   | 
                    | MATTF                    
                     | Mattawoman Creek                    
                     | Tidal Fresh                    
                   | 
                    | PISTF                    
                     | Piscataway Creek                    
                     | Tidal Fresh                    
                   | 
                    | ANATF
                     | Anacostia River                    
                     | Tidal Fresh                    
                   | 
                    | 
                     | 
                     | 
                   | 
                    Lower Zone 
                    
                     | 
                     | 
                               
                 | 
                  | Segment Name
                    
                   | 
                   | Salinity Regime
                                    
                 | 
                                                                                                                                                                              | CB6PH
                                                                                                                                                                               | Western Lower Chesapeake Bay
                   | Polyhaline
                   | 
                    | CB7PH
                     | Eastern Lower Chesapeake Bay
                     | Polyhaline                  
                   | 
                    | RPPMH 
                     | Lower Rappahannock River | Mesohaline
                   | 
                    | CRRMH
                     | Corrotoman River | Mesohaline
                   | 
                    | RPPOH
                     | Middle Rappahannock River
                     | Oligohaline
                   | 
                    | RPPTF
                     | Upper Rappahannock River
                     | Tidal Fresh
                   | 
                                                                                                                                                                                            | PIAMH
                                                                                                                                                                                             | Piankatank River
                     | Mesohaline
                   | 
                                                                                                                                                                                              | MOBPH
                                                                                                                                                                                               | Mobjack Bay
                     | Polyhaline
                   | 
                                                                                                                                                                                                | YRKPH
                                                                                                                                                                                                 | Lower York River
                     | Polyhaline
                   | 
                                                                                                                                                                                                  | YRKMH
                                                                                                                                                                                                   | Middle York River | Mesohaline
                   | 
                                                                                                                                                                                                    | MPNOH
                                                                                                                                                                                                     | Lower Mattaponi River
                     | Oligohaline
                   | 
                                                                                                                                                                                                      | MPNTF
                                                                                                                                                                                                       | Upper Mattaponi River
                                                                                                                                                                                                       | Tidal Fresh
                   | 
                                                                                                                                                                                                        | PMKOH
                                                                                                                                                                                                         | Lower Pamunkey River
                                                                                                                                                                                                         | Oligohaline
                   | 
                                                                                                                                                                                                          | PMKTF
                                                                                                                                                                                                           | Upper Pamunkey River
                                                                                                                                                                                                           | Tidal Fresh
                   | 
                                                                                                                                                                                                            | JMSPH
                                                                                                                                                                                                             | Mouth of James River
                                                                                                                                                                                                             | Polyhaline
                   | 
                                                                                                                                                                                                              | JMSMH
                                                                                                                                                                                                               | Lower James River
                                                                                                                                                                                                               | Mesohaline
                   | 
                                                                                                                                                                                                                | ELIPH
                                                                                                                                                                                                                 | Lower Elizabeth River
                                                                                                                                                                                                                 | Polyhaline
                   | 
                                                                                                                                                                                                                  | WBEMH
                                                                                                                                                                                                                   | Western Branch of the Elizabeth River
                                                                                                                                                                                                                   | Mesohaline
                   | 
                                                                                                                                                                                                                    | SBEMH
                                                                                                                                                                                                                     | Southern Branch of the Elizabeth River | Mesohaline
                   | 
                    | EBEMH
                     | Eastern Branch of the Elizabeth River | Mesohaline
                   | 
                    | LAFMH
                     | Lafayette River
                     | Mesohaline
                   | 
                    | CHKOH
                     | Chickahominy River | Oligohaline
                   | 
                    | JMSOH
                     | Middle James River
                     | Oligohaline
                   | 
                                          | JMSTF1
                                           | Upper James River Segment 1 
                                           | Tidal Fresh
                   | 
                    | JMSTF2
                     | Upper James River Segment 2 
                     | Tidal Fresh
                   | 
                                                                                                                                                                                                                                                                                                                                                          | APPTF
                                                                                                                                                                                                                                                                                                                                                           | Appomattox River
                                                                                                                                                                                                                                                                                                                                                           | Tidal Fresh
                   | 
                    | CB8PH
                     | Mouth of the Chesapeake Bay
                     | Polyhaline
                   | 
                    | LYNPH
                     | Lynnhaven & Broad Bays
                     | Polyhaline
                   | 
                    |                   
                 | 
                    Delmarva Peninsula Coastal Bays Zone 
                        
                               
                 | 
                    | Segment Name
                    
                     | 
                     | Salinity Regime
                    
                               
                 | 
                    | AAWPH
                     | Assawoman Bay
                     | Polyhaline
                 | 
                    | IOWPH
                     | Isle of Wight Bay | Polyhaline
                     | 
                     | 
                     | 
                   | 
                     | 
                     | 
                | 
                    | SPXPH
                     | Sinepuxent Bay
                     | Polyhaline   
                 | 
                    | CHNPH
                     | Chincoteague Bay
                     | Polyhaline  
                 | 
                    | SVCPH
                     | Southern Virginia Coastal Bays
                     | Polyhaline
                
               |