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Video was acquired on September 26, 27, and 28, 1989. The upper and lower reaches of the Colorado River were flown on September 26; the Green River was flown September 27 from the confluence (river-mile 0) to approximately the Ouray bridge (river-mile 245), and on September 28 from the Ouray bridge to the confluence of the Green and Yampa Rivers. Flows (fefs) as measured at various GS gauges (GS Water Resources records) for these dates, as well as those for the Green River during 1988, were as follows: 1989 Sept. 26 Sept. 27 Sept. 28 1988 Aug. 23 Aug. 27 Aug. 28 Colorado River Green River Cameo aauge fe/s 1,990 1,970 1,950 Green River aauae fe/s 1,660 1,640 1,590 State Line qauge* ft3 Is 2,990 2,940 2,910 Jensen aauae ft3 Is 1,023 1,023-1,236 1 ,420 1,188 1,270 1,234 1,989 1,764 1,918 * Note: GS gauge readings are .:!:..200 ft3/s. An lkigami video camera attached to the front of a helicopter on a Tylor mount was used to obtain the video. The camera was connected to a monitor viewed by a flight scientist in the helicopter and another monitor viewed by the pilot. This allowed the helicopter pilot to maintain the river in the center of the video image. The flight scientist also annotated the video tape with audio information about backwaters, side channels, general water turbidity, and weather conditions as they appeared visually from the helicopter. This function served as a "ground truthing" effort which assisted the video interpreter in identifying river features on the video monitor in the laboratory. The video images were analyzed on a 386 microcomputer system which included a video capture board and two color monitors. Analysis was performed with MIPS (Map and Image Processing System) software. Video images were viewed on the color monitors and captured in continuous overlapping frames along the entire length of the four study sites. The video image was viewed repeatedly until the computer operator was confident if backwaters or side channels were present and what their boundaries were. The video frame capturing monitor and a second high resolution monitor were used to delineate habitats and to more accurately locate the streambank for measurement of channel width. The audio portion of the tape was listened to at this time to assist the computer operator in interpreting the video image. Video scale was calculated by measuring the length of highway bridges measured on the ground at six locations within the four study reaches. River-mile segments and the bridges used for their respective calibration were as follows: 2