Related by context. Frequent words. (Click for all words.) 56 tidal marshes 55 freshwater mussels 53 mussel species 52 oxbow 52 tidal rivers 52 freshwater lakes 51 Sediments 51 freshwater ponds 51 lakes 51 coastal estuaries 51 rivers 51 Elevation normal 50 tributaries 50 estuaries 50 tailwaters 50 aquatic habitats 50 headwater streams 49 Ocmulgee River 49 Apalachicola River 49 Algae blooms 48 creeks rivers 48 tidal marsh 48 toxic algae blooms 48 Floridan Aquifer 48 streams creeks 48 Waccamaw River 48 mainstem 48 bowfin 48 creeks 48 river deltas 48 mercury contamination 48 waterways 48 native brook trout 48 headwaters 47 beaver pond 47 arsenic mercury 47 Creek tributary 47 sediment 47 dissolved oxygen 47 tidal creeks 47 freshwater 47 river basins 47 lake 47 dissolved oxygen levels 47 alpine lakes 47 Conemaugh River 47 tributary streams 47 brackish waters 47 tidal pools 47 drainage basins 47 Northeast Cape Fear 47 bottomlands 46 Congaree River 46 waters 46 tidal wetlands 46 pollutants 46 creek 46 fecal bacteria 46 Tombigbee River 46 inland waters 46 shoreline 46 watersheds 46 Cahaba River 46 Alafia River 46 algae blooms 46 tributary 46 total dissolved solids 46 Altamaha 46 Coho salmon 46 creeks streams 46 shorelines 46 freshwater ecosystems 46 headwater 45 heavily polluted 45 fecal coliform 45 River basin 45 salt marshes 45 turbidity 45 shallow bays 45 freshwater wetlands 45 algal bloom 45 marsh grasses 45 Budd Inlet 45 Pigeon River 45 mercury 45 estuarine 45 Lake Wateree 45 eel grass 45 bottomland 45 water 45 clams mussels 45 sediments 45 aquatic ecosystem 44 saltwater 44 river basin 44 fecal coliform bacteria 44 rivers lakes 44 freshwater lake 44 aquatic ecosystems 44 microscopic algae 44 biologically diverse