The Spring Mountains National Recreation Area (SMNRA) is seeking to purchase wildlife-friendly fencing to enclose spring emergences. Wildlife-friendly fencing can take several forms. We have decided o... The Spring Mountains National Recreation Area (SMNRA) is seeking to purchase wildlife-friendly fencing to enclose spring emergences. Wildlife-friendly fencing can take several forms. We have decided on metal jack-rail fencing to minimize ground disturbance, ensure ease of set up, while protecting both the springs and dependent wildlife.