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e e e ODl193 Main Stem Gunnison River Inflows below Gunnison Tunnel: INFL3 and INFL4 Excluding the Uncompatgre River, gains for the mainstem of the Gunnison River below the Gunnison Tunnel were developed using 4 USGS gaging stations: the Gunnison River near Grand Junction (09152500), the Gunnison River below Gunnison Tunnel (09128000), the Uncompahgre River at Delta (09149500), and the Gunnison River at Delta (09144250). The first 3 stations represent the boundaries of the reach, and the last station divides the reach into upper and lower reaches, These 2 reaches represent the Gunnison River above and below the mouth of the Uncompahgre River, Sufficient streamflow records exist to compute the gains for the entire reach for the period of study by subtracting the flows of the Gunnison River below the tunnel and the Uncompahgre River at Delta from the flow of the Gunnison River near Grand Junction, The gains for the years before 1964 were adjusted to reflect depletions and change in storage which would have occurred if the Paonia and Smith Fork Projects were operating, The Gunnison River at Delta has 10 years (1977-86) of streamflow records that are concurrent-with the other 3 stations, With the data from this station, the gains for 1977-86 for the upper and lower reaches were computed, Subtracting the flows of the Gunnison and Uncompahgre Rivers at Delta from the Gunnison River near Grand Junction showed that one-third of the time a loss occurred in the lower reach, with most of the losses occurring from 1982-1986, A review of the computed gains in this reach indicated that the losses are not likely and are probably a result of the accuracy of one or more of the gaging stations. A comparison of the magnitude of the losses to the flow of the 2