Big Basin-Storage Ponds 3 & 4 are two earth dams located in McPherson, Kansas, completed in 2007 with a primary purpose that is unspecified. These dams are owned by the state and have a maximum storage capacity of 128.6 acre-feet. The dams have a low hazard potential and are classified as very high risk due to their location in the Blaze Fork-TR river or stream.

The dams have a controlled spillway type and a structural height of 8 feet, with a total length of 6519 feet. Despite not being rated for condition assessment, the dams do not have a state jurisdiction, permitting, inspection, or enforcement. These structures play a crucial role in water resource management in the area and contribute to the overall climate resilience of the region. With their strategic location and design, Big Basin-Storage Ponds 3 & 4 are significant assets in the state's water infrastructure.