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<br />A method of estimating the size of bed material was developed <br /> <br />because of the difficulties in measuring large particles in fast-flowing <br /> <br />water. The particles' upstream height and width above the streambed <br /> <br />were measured and found to correlate well with dSO measured using the <br /> <br /> <br />Wolman (19S4) method. At 17 of 18 sites sampled, the estimated particle <br /> <br /> <br />sizes of the bed material differed 0.2 ft (6.1 mm) or less from dSO' <br /> <br /> <br />Data on the axis orientation of individual particles indicate that the <br /> <br />long, or a-axis was vertical in 1 percent of the particles; the inter- <br />mediate, or b-axis was vertical in 13 percent of the particles, and the <br />short, or c-axis was vertical in 86 percent of the particles. <br /> <br />ACKNOWLEDGMENTS <br /> <br />This study was authorized by a cooperative agreement between the <br /> <br />U.S. Geological Survey and the State of Colorado, Department of Natural <br /> <br />I <br /> <br /> <br />Resources, Colorado Water Conservation Board. 1 would like to thank my <br /> <br /> <br />colleagues at the Colorado District (unfortunately too numerous to <br /> <br /> <br />mention) for their help with the field work and preparation of the data. <br /> <br />~ <br />