Related by context. Frequent words. (Click for all words.) 59 mussel species 57 hydro electric dams 56 hydro dams 56 wetland ecosystems 56 spawning habitat 55 hydroelectric turbines 55 navigable rivers 54 intermittent streams 54 headwater streams 54 hydropower dams 53 waterpower 53 wetland habitats 53 hydroelectric dams 53 freshwater marshes 52 oxbows 52 riparian zones 52 aquatic ecosystems 52 hydropower 52 deplete oxygen 52 groundwater aquifers 51 forested wetlands 51 migratory fish 51 recharge groundwater 51 Yellowstone cutthroat trout 51 kilovolt transmission lines 51 aquatic habitat 51 freshwater ecosystems 51 Soil erosion 50 tributary streams 50 tidal marsh 50 rivers 50 riparian habitat 50 Reverse osmosis 50 aquatic ecosystem 50 freshwater 50 freshwaters 50 wildlife habitat 50 tidal marshes 50 hydroelectricity 50 nonrenewable resources 50 cypress forests 50 spawning grounds 50 Invasive plants 50 hydroelectric 50 reed beds 49 Coal gasification 49 hydroelectric plants 49 salination 49 riparian vegetation 49 tidal wetlands 49 freshwater wetlands 49 desalinization plants 49 Dalles Dam 49 spruce fir 49 fertile soils 49 overharvested 49 wetland habitat 49 aquatic invertebrates 49 biomass geothermal 49 beaver ponds 49 Severn estuary 49 tidal turbines 49 coniferous forests 49 fragile ecology 48 woody vegetation 48 Stormwater runoff 48 dams 48 anadromous fish 48 temperate rainforest 48 headwaters 48 watersheds 48 sewage effluent 48 irrigated farmland 48 navigable waterways 48 nesting seabirds 48 estuaries 48 croplands 48 aquatic habitats 48 hardwood forests 48 waterways 48 coastland 48 headwater 48 Ocklawaha River 48 Everglades ecosystem 48 hydro electric 48 grassland habitat 47 wildlife habitats 47 sulfur dioxide nitrogen oxide 47 Algae blooms 47 habitats 47 Farmed salmon 47 ecosystems 47 evaporation ponds 47 fish hatcheries 47 potent greenhouse gas 47 sewage discharges 47 hydro electric dam 47 bd.className + = 47 hydro electric power 47 wellfields 47 migratory shorebirds