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A detailed account of these remnants of lava flows and other features of local volcanism appears in a paper by McKee and Schank titled "The Lower Canyon Lavas and Related Features of Toroweap in Grand Canyon, " published in the Journal of Geomorphology, Volume 5, Number 4, pages 243-273 (1942). d. Recreation The most obvious change in recreational use of the canyon brought about the Bridge Canyon project would be the limitation of the traditional and exhilarating experience of wild river boating for which the Grand Canyon is famous. This unique form of recreation was beginning to show a marked increase prior to the closure of the Glen Canyon Dam. Since 1955 more than 1300 persons enjoyed best trips through Grand Canyon, nearly 400 of these made the trip last year. Undoubtedly the running of the Grand Canyon would grow in popularity in the years ahead as the quality of such an experience and its safety with proper preparation, equipment, and guidance became more widely known. the proposed low Bridge Canyon Dam would reduce the amount of possible river running through the Grand Canyon by more then 80 miles, a reduction of 36.8 per cent. 2. Values to be gained A fair evaluation of the effects of the proposed Bridge Canyon Reservoir cannot be made without giving consideration to artificially created values which will result. With the completion of the dam and a highway from U. S. 66 to the damsite, the Bridge Canyon Reservoir would become a new recreation attraction of the region. This wild and presently relatively inaccessible area would be opened to large numbers of people who will want to take boat trips on a fjord-like reservoir set in the incomparable scenery of the Grand Canyon. The kind of activity common to recreation areas such as power boating, water skiing, fishing, swimming and camping would be enjoyed by an estimated 500,000 people a year, of which it is estimated that 150,000 would take scenic boat trips. Species of sport fish, as in Lake Mead, would probably be introduced into the reservoir--largemouth black bass, bluegill, crappie, sunfish and others. An additional, possible recreation benefit may be the flushing of a portion of the silt from the Grand Canyon section of Lake Mead below Bridge Canyon Dam, sufficient perhaps to permit boating in this spectacular setting again. 3Epson Perfection 4870 Photo, 400 dpi, 8 bit, 16,023,552 byte