Final answer:
The second-largest spring in the US is Big Spring in Missouri, with an average flow of 276 million gallons per day. It is located within the Ozark National Scenic Riverways and contributes to the Current River.
Step-by-step explanation:
The second-largest spring in the United States is Big Spring. Located in the Ozark National Scenic Riverways in Missouri, Big Spring is one of the largest springs in the world based on average daily volume of water discharged. The largest spring in the US is Silver Springs in Florida. Big Spring contributes to the Current River, known for its clear and cool water, ideal for trout habitats. The average flow of Big Spring is about 276 million gallons per day, showcasing the impressive nature of this natural freshwater source. Visitors to Big Spring can marvel at its vibrant blue waters and the lush vegetation that thrives around it, making it a popular destination for outdoor enthusiasts and nature lovers.