In this work , BVRI light curves of 55 Type II supernovae ( SNe II ) from the Lick Observatory Supernova Search program obtained with the Katzman Automatic Imaging Telescope and the 1 m Nickel telescope from 2006 to 2018 are presented . Additionally , more than 150 spectra gathered with the 3 m Shane telescope are published . We conduct an analyse of the peak absolute magnitudes , decline rates , and time durations of different phases of the light and colour curves . Typically , our light curves are sampled with a median cadence of 5.5 days for a total of 5093 photometric points . In average V -band plateau declines with a rate of 1.29 mag ( 100 days ) ^ { -1 } , which is consistent with previously published samples . For each band , the plateau slope correlates with the plateau length and the absolute peak magnitude : SNe II with steeper decline have shorter plateau duration and are brighter . A time-evolution analysis of spectral lines in term of velocities and pseudoequivalent widths is also presented in this paper . Our spectroscopic sample ranges between 1 and 200 days post-explosion and has a median ejecta expansion velocity at 50 days post-explosion of 6500 km s ^ { -1 } ( H \alpha line ) and a standard dispersion of 2000 km s ^ { -1 } . Nebular spectra are in good agreement with theoretical models using a progenitor star having a mass < 16 { M } _ { \odot } . All the data are available to the community and will help to understand SN II diversity better , and therefore to improve their utility as cosmological distance indicators .