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\15,884 , 1 O,~5) Bureau of Reclamation t~' Iq~1 o /l1f'"l '-61~ UNITED STATES GOVERNMENT memorandum / ~'-' I -}- TO Memorandum Head, Remote Sensing Section Denver, Colorado DATE: January 26, 1987 FROM Michael J. Pucherelli, Environmental Biologist SUBJECT: A Summary of Methods and Results for the Green River Backwater Pilot Study Using Remote Sensing and GIS (Geographic Information Systems) Applied Sciences Referral Memorandum No. AP-87-4-2 Principal Investigator: Michael J. Pucherelli Background In response to a request from Mr. Bob Williams of the Upper Colorado Regional Office, a backwater study on the Green River below Flaming Gorge Dam has been developed and implemented. This pilot study included a trend analysis of backwater areas and numbers as they relate to Colorado Squawfish and fluctuating flows. The study examined the feasi- bility of using 1:2,000 versus 1:4,000 scale aerial photography. The utilization of color versus color infrared photography for the interpre- tation of backwaters was also examined. Study sites were selected non- randomly and therefore the data reported are specific to the individual study si tes. Methodology, results, and recommendations for future stud- ies are reported below. The interpretation and digitization of the aerial photography was accomplished by Advanced Sciences Inc., the Bureau's in-house contracting staff. Methodology The objectives of the pilot study were to examine and quantify backwater trends as they relate to varying flows in the Green River below Flaming Gorge Dam. The study sites were selected by the Bureau of Reclamation and the U.S. Fish and Wildlife Service. The three study sites selected are each approximately 3 river miles in length. The three study sites are located by river miles in the list below: (also see Location Map, Figure 1).