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t Establishment of a Green River Gage in Canyonlands National Park, Utah 1995-1996 Introduction Biologists, engineers and scientists working in Canyonlands National Park requested that a river gage be established in this reach of the Green River to support data collection related to the Recovery Program for the Endangered Fishes in the Upper Colorado River Basin. The gage will also support scientific efforts in the lower Green River related to flow hydrograph analyses. River discharges throughout the Green River were monitored in 1996 and are compared with the discharges estimated in Canyonlands. This data will be valuable to flow routing predictions in the Green River system. The initial establishment of the river a e was accom lished in conjunction with the 1995 gg P flooded bottomlands data collection in the Anderson Bottom reach of the Green River in Canyonlands National Park. The flooded bottomlands project encompassed river channel surveys, topographic surveys of the floodplain and side canyon bottomlands, discharge measurements and analysis of the river response to high flows which directly supported the establishment and calibration of the river gage in this reach. This bottomlands investigation was conducted as a component of the Habitat Restoration Program in the Recovery Program for the Endangered Fishes of the Upper Colorado River Basin. The staff gage was remains in place at Bonita Bend. The level logger was re-installed in 1996 on April 5 and was removed on July 24. It was in operation during the entire high flow season. In 1995, the level logger operated only 12 days before being dislodged by high flows. A FLO Engineering (1995a) report was prepared for the Canyonlands gage installation and operation in 1995 entitled, "Establishment of a Green River Gage in Canyonlands National Park, Utah." Project Goal l The goal of the project was to establish a discharge gaging station in the Canyonlands reach of the Green River and to determine the discharge relationship between flows in Canyonlands and the discharges reported at the upstream USGS gages and level loggers in the Green River system. To accomplish this goal, a rating curve was developed for the Canyonlands reach of the Green River. The project objectives included the erection of a staff gage, installation ' of river stage monitoring equipment, survey and erection of permanent topographic benchmarks, discharge measurements, cross section surveys and maintenance. The initial work to establish the gaging station was conducted by the FLO Engineering field crews working on the flooded bottomlands project. t