Two measurements were made in the reach between Glen Canyon Dam and the streamflow gaging station Colorado River at Lees Ferry, in May 1991. The samples were collected from the center of flow, about halfway between the center and the left bank, and halfway between the center and the right bank.
Data are time, in decimal day, and concentration, in micrograms per liter.
Releases during the May 22 measurement were quite steady. Discharge was approximately steady during the travel time of the dye. Injection on May 8 was at 1200. Injection on May 22 was at 1235. Injection was at 1305 on May 20, 1991.