LIDAR GUIDED FIELD RECONNAISSANCE OF KARST FEATURES ON THE MOGOLLON RIM, COCONINO NATIONAL FOREST, SOUTHERN COLORADO PLATEAU
To expand the knowledge of these surficial processes, this project focused on the rapid field inventory and assessment of karst terrain within the 64,000 acre Cragin Watershed Protection Project located on the Mogollon Rim District of the Coconino National Forest in Happy Jack, Arizona. Here, 15 Ma lava flows locally cap the expansive 250 Ma Kaibab Formation and both were found to contain abundant karst features. Using LiDAR and GPS, 286 potential karst feature sites were surveyed over a two month period. The inventory assessed 29% karst features and 38% pseudokarst features, with 31% being non-karst features. Of the karst features, 10% are emerging/sinking streams, 80% are sinkholes, and 10% are caves. Using ArcGIS Collector, data and photographs were acquired in-situ, uploaded to a shared database, and used within ArcMap to create a feature geodatabase. Resource protection buffers were designed for karst and pseudokarst features to offer protection from logging disturbance, preserve the microclimate and ecology of a feature, and prevent unnatural sedimentation rates that would destroy ecosystems and affect groundwater entering the 15,000 acre-feet C.C. Cragin Reservoir. Results suggest that within a 64,000 acre contributing area, a large number of karst and pseudokarst features play a significant role in the hydrologic system associated with the Cragin reservoir.