ENPO121205_D021 Published December 8, 2012 at 1312 × 897 in Wildfire Recovery at The Niobrara Valley Preserve – Asking The Big Questions Soil erosion will probably be an issue on steep slopes and under formerly dense stands of trees. The Nature Conservancy’s Niobrara Valley Preserve about four months after the 2012 wildfire. North side of the river.