The Truckee River is a big river that flows through some parts of California and Nevada. It's kind of like a long snake made of water. The river starts up in the mountains and goes down to where it ends in a big lake called Pyramid Lake.
People like to go near the Truckee River to fish, swim, or just play in the water. The river is also important for something called irrigation, which is when people use the water to help plants grow.
Sometimes, the water level in the river can get very high and it can be dangerous. When that happens, people need to be careful and stay away from the river until the water goes down.
Overall, the Truckee River is really cool because it gives us water to drink, helps us grow food, and is a fun place to play!