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OO~331 '_~ r ; , . . -2- Filter 2, Water Resource Development--This filter is designed to identify those river segments which are free of existing impoundments or other alterations such as channelization, straightening, dikes, and levees. This determination is made by use of Corps of Engineers Water Resource Booklets, Soil Conservation Service Reports, Federal Energy Regulatory Commission Reports, Bureau of Reclamation Reports, and USGS 7~- and 15- minute quad sheets. Segments containing such water resource developments are eliminated from further consideration. Remnant segments between or above or below development are retained if they are 5 miles or longer in length. Filter 3, Cultural Deve1opment--This filter serves to identify river segments significantly impacted by manmade developments. The area of influence is considered to be ~ mile on each side of the river bank. Cultural developments are located on quad sheets, county highway maps, and, where necessary, aerial photos; scored according to an assigned point system; and river segments over 100 points per mile are eliminated. Again, remaining segments over 5 miles in length are retained. Filter 4, Input by Experts--At this point the list of rivers remaining is circulated among government officials, private organizations, and individuals who are knowledgeable about the river resources. This is done in order t~ further eliminate, or retrieve previously eliminated, river segments as a result of the knowledge of these individuals. This is accomplished through mail-outs and Statewide or areawide workshops. Filter 5, Aerial Survey--Approximately 20 percent of the total river mileage in each physiographic section will be examined by helicopter and documented by video tape or color slides. These will be the river segments that at that point are determined to be the most natural within each section. Filter 6, Post Flight River Evaluation--This filter is used to compare rivers within a given physiographic area to determine the most repre- sentative or outstanding river segments. River resource information is recorded (where necessary, assistance is requested from specialists in gathering necessary data) for each river segment, and this information is used to establish a priority list of rivers. POTENTIAL FUTURE USES The result of this inventory will be a list, by physiographic s~ction, of the most natural free-flowing rivers nationwide. While it will assist the Department of the Interior in making decisions related to the Wild and Scenic Rivers System, it will serve also as a centralized r