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002536 . . The estimates by the two states of deliveries of trans- mountain water during the 1950-85 period were also close. These delivery figures are somewhat less than the total amounts of water imported from the western slope of the Rockies since some of that water is used outside of the Arkansas River Basin, some is lost to reservoir evaporation, and in a given year water is sometimes held over in storage. Kansas estimated 60,445 acre-feet as the average annual amount of transmountain water delivered to the Colorado canal companies for irrigation use during the 1950-85 period. The best comparable Colorado estimate was 56,210 acre-feet. Colo. Exh. 846. Kansas makes no claim to this transmountain water. RT Vol. 11 at 127. It is specifically excluded from the Arkansas River Compact. Article III-B. Nonetheless, return flows from such imports still affect downstream flows and use. Considering only native Arkansas River flows, that is, excluding transmountain imports, the mainstream supply does not show an historic decline. Recent averages remain quite comparable to earlier estimates.111 Declining flows at the Stateline cannot be explained by a comparable decrease in the mainstream inflow from the mountains. Colorado maintains, however, that the inflows from the tributaries have declined. 111 For example, Colorado's figures at Pueblo show an average annual flow of 534,565 acre-feet for 1950-65, increasing to 621,395 for the 1966-85 period. Calculated from Colo. Exh. 831; Jt. Exh. 94 at 27. Of course, these later flows reflect larger transmountain imports after 1972 when the Fry~ngpan-Ar~ansas Project came on line. But even so, the nat1ve suppl1es compare favorably with long-time Canon City gaged amounts. _136672 -56-