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• Miller; Reconnaissance of Ground-Water Resources in a part of the Yampa River Basin between Craig and Steamboat Springs, Colorado, U.S. Geologic Survey Water-Resources Investigations Report 77-4, 1977, by R.E. Brogden and T.F. Giles; Surface Geologic Map of the Twentymile Park Area, 1977, and proprietary maps. The above referenced maps were drawn using aerial photography, ground reconnaissance and subsurface drilling and geophysical techniques. The information compiled from these references has been verified by field observations. The alluvial deposits in the drainage of Middle and Fish, Creeks and their tributary stream channels were mapped using the geomorphic criteria of slope breaks, where the essentially flat-lying stream laid deposits meet the sloping valley walls. Terraces are included in the floodplain deposits. Areas where unconsolidated deposits have been removed by erosion do not meet the applicable geomorphic criteria. • Unconsolidated stream-laid deposits in the proposed permit and adjacent area were mapped in detail by field checking the surficial geology and digging backhoe pits to determine the litho logy of the stream-laid deposits. In addition, the low-lying areas which contain alluvial deposits were field checked to verify the existence or non- existence of stream channels 3.0 feet wide and 0.5 feet deep, which meet the definition of "unconsolidated stream-laid deposits holding streams" in Rule 1.04. Ephemeral drainages containing alluvial deposits with stream channels not meeting the size criteria of the above definition were not mapped in the intermittent and perennial drainages traversing the proposed permit and adjacent area. Alluvial deposits were found in the floodplain of Middle Creek near the proposed permit area. Middle Creek headwaters are located in the Routt National Forest in Township 3N, Range 87W and the stream flows north through Twentymile Park into Trout Creek outside the general • area. 2.06-12