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A low-dispersion Keck I spectrum of SN 1980K taken in August 1995 (t = 14.8yr after explosion) and a November 1997 MDM spectrum (t = 17.0 yr) show broad5500 km s^{-1} emission lines of H\alpha, [O I] 6300,6364 A, and [O II]7319,7330 A. Weaker but similarly broad lines detected include [Fe II] 7155 A,[S II] 4068,4072 A, and a blend of [Fe II] lines at 5050--5400 A. The presenceof strong [S II] 4068,4072 A emission but a lack of [S II] 6716,6731 A emissionsuggests electron densities of 10^{5-6} cm^{-3}. From the 1997 spectra, weestimate an H\alpha flux of 1.3 \pm 0.2 \times 10^{-15} erg cm^{-2} s^{-1}indicating a 25% decline from 1987--1992 levels during the period 1994 to 1997,possibly related to a reported decrease in its nonthermal radio emission.Comment: 21 pages, 8 figures, submitted to the Astronomical Journa

Late-Time Optical and Ultraviolet Spectra of SN 1979C and SN 1980K