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Price Model PAA meter currently being developed by the Survey. The Price Model PAA meter incorporates a Lexan polycarbonate polymer, solid-cup bucket wheel in place of the metal, open-cup bucket wheel common to the Price type AA meter. Both current meters were equipped with a cat's whisker contact chamber. The hydrologic data in this report consists of point velocities obtained using both the Price type AA and Model PAA current meters at 11 streamflow- gaging stations in Colorado. Water-surface slope data and bed-material size data for each station also is presented. A total of 887 point velocity meas- urements were made with each current meter resulting in 94 velocity profiles for each meter. Site Selection Eleven streamflow-gaging stations were selected to provide a variety of flow conditions including water-surface slope, depth, and bed material. A general description of the stream reach ~t each station and the assigned site number are given in table 1. The location of the study area is shown in fig- ure 1; the locations of the selected streamflow-gaging stations are shown in figure 2. To provide a basis for comparison, stations with moderate slopes of 0.001 (South Platte River) and 0.002 (Cache La Poudre River) were among those selected for the study. Water-surface slopes ranged from 0.001 at the South Platte River to 0.029 at Lake Creek. Observation depths ranged from 1.15 to 11.2 feet. Almost half of the velocity profiles were obtained in depths of less than 2.5 feet. Nine profiles were obtained in depths greater than 5.0 feet. Bed material ranged from sand to large boulders. Bed material at the South Platte River site was all sand, while the Lake Creek site con- tained boulders as large as 3 feet in diameter. Table 1.--Streamflow-gaging stations selected for velocity-profile study and corresponding water-surface slopes Site Station number and name Latitude Longitude Slope No. + 1 Q6H05.00 _.. Bear Creek at M8rri-s'hl ...----- 3" -n+rr' - T(J5n'li3~ 022 2 06716500 Clear Creek near Lawson--------- 39 45' 57" 105 37'32" 0.005 3 06719505 Clear Creek at Golden----------- 39 45 '11" 105 14' 05" 0.006 I 4 06752260 Cache La Poudre River at Fort Collins----------------------- 40 35' 17" 105 04'08" 0.002 5 06754000 South Platte River near Kersey-- 40 24'44" 104 33'46" 0.001 6 07083700 Arkansas River near Malta------- 39 10'08" 106 19'23" 0.002 7 07084500 Lake Creek above Twin Lakes Reservoir--------------------- 39 03'47" 106 24'26" 0.029 8 07086500 Clear Creek above Clear Creek Reservoir--------------------- 39 01 r 05" 106 16'38" 0.008 9 07089000 Cottonwood Creek below Hot Springs, near Buena Vista----- 38 48'46" 106 13' 18" 0.022 10 09046600 Blue River near Dillon---------- 39 32'55" 106 02'19" 0.013 11 09050100 Tenmile Creek below North Fork Tenmile at Frisco------------- 39 34'35" 106 06'30" 0.009 3