* Agricultural runoff: Chemicals and fertilizers from farms and ranches can run off into the river, polluting the water and harming wildlife.
* Industrial wastewater: Wastewater from factories and other industries can contain harmful chemicals that can contaminate the river.
* Municipal wastewater: Sewage from cities and towns can also pollute the river, especially if it is not properly treated.
* Trash and litter: Trash and litter can clog the river and harm wildlife.
* Oil and gas production: Oil and gas production can contaminate the river with chemicals and heavy metals.
Climate Change
* Drought: Droughts can reduce the amount of water in the river, making it more difficult for fish and other wildlife to survive.
* Flooding: Flooding can wash away topsoil and damage infrastructure, and can also spread pollutants into the river.
* Increased water temperature: Increased water temperature can harm fish and other aquatic life.
Invasive Species
* Zebra mussels: Zebra mussels are a type of invasive mussel that can clog water pipes and damage infrastructure.
* Quagga mussels: Quagga mussels are another type of invasive mussel that can compete with native mussels for food and habitat.
* Asian carp: Asian carp are a type of invasive fish that can outcompete native fish for food and habitat.
Habitat Loss
* Urban development: Urban development can destroy or fragment natural habitats, making it difficult for wildlife to survive.
* Agriculture: Agriculture can also destroy or fragment natural habitats, especially when it is practiced on a large scale.
* Mining: Mining can destroy or fragment natural habitats, and can also pollute the water and air.
* Recreation: Recreation can also damage natural habitats, especially when it is not properly managed.