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-8- flakes were found, a site form was filled out either by the principal in- vestigator or by one of the crew members under his direct supervision while other members of the crew continued to search the area or took photographs as directed. Site locations were mapped on 7~' USGS quad sheets. Indi- vidual finds were usually not mapped within the site area because it was felt that the information obtained would not justify the time required to do the mapping, at least within the context of a site inventory. Controlled surface collection on a site gridded off in squares of predetermined size and tied into a datum point, however, is an important information recovery technique used in further investigation of sites that cultural resource inventories identify as having significant archeological potential. The survey of the railroad rights of way, which included an area 500 feet on either side of the railroad center line, was conducted by spacing /' the crew members in a straight line at right angles to the right of way and walking along the right of way. The principal investigator stayed in the center of this line to ensure that the area being covered was in fact on the right of way. This was accomplished by continually comparing the plan and profile sheets included in the Morrison-Knudsen feasibility study with topographic features, since the 7~' quad sheets were too small scale for the purpose. The right of way survey would have been further facilitated if the railway centerlines had been staked at intervals of less than a quarter mile. Most of the railroad right of way was readily accessible from existing roads. One portion of Route A, however, from the confluence of the Yampa and Williams Fork to Milk Creek is relatively inaccessible. Also, the topography of that section of Route A consists of narrow benches and terraces along the left bank of the Yampa separated by stretches of cliff so steep that the possibility of prehistoric or historic sites existing on them was virtually nil. Consequently, a four man rubber raft (which, incidentally, will hold only two persons in comparative safety) was used to survey that section of Route A. The procedure used was to drop off the principal investigator and another crew member on the Yampa near the Williams Fork while the other two members proceeded by vehicle to Bell Rock Gulch and Round Bottom to survey Route B. The river crew was picked up at the end of the day at Round Bottom by the vehicle crew. This procedure was used for three days and it is estimated that five or six man-days were saved by using the raft.