The J & N Ranch Dam, also known as Carson Dam, is a private earth dam located in Leavenworth, Kansas, near the Missouri River. With a height of 33 feet and a length of 350 feet, this dam serves multiple purposes, including fire protection, stock, and small fish pond usage. It has a storage capacity of 71 acre-feet, with a normal storage level of 33.6 acre-feet, covering a surface area of 3.85 acres and draining a small area of 0.13 square miles.

Managed by the Natural Resources Conservation Service and regulated by the Kansas Department of Agriculture, this dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Although the last inspection was conducted in 2004, with no recent updates available, the dam's design by McDonald & Warger Inc. and USDA NRCS showcases a commitment to ensuring its structural integrity and functionality for fire protection and water resource management in the surrounding area. Water resource and climate enthusiasts can appreciate the contributions of the J & N Ranch Dam in enhancing local water availability and ecosystem support.