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Ultraluminous infrared galaxies (ULIRGs) represent a critical stage in themerger-driven evolution of galaxies when AGN activity is common and AGNfeedback is expected. We present high sensitivity and large field of viewintergral field spectroscopy of the ULIRG Mrk 273 using new data from the KeckCosmic Web Imager (KWCI). The KCWI data captures the complex nuclear region andthe two extended nebulae in the northeast (NE) and southwest (SW) to $\sim 20$kpc scales. Kinematics in the nuclear region show a fast, extended, bipolaroutflow in the direction of the previously reported nuclear superbubblesspanning $\sim 5$ kpc, two to three times greater than the previously reportedsize. The larger scale extended nebulae on $\sim 20$ kpc show fairly uniformkinematics with FWHM $\sim 300 ~\kmps$ in the SW nebula and FWHM $\sim 120~\kmps$ in the NE nebula. We detect for the first time high ionization[NeV]3426, [OIII]4363 and HeII4684 emission lines in the extended NE nebula.Emission line ratios in the nuclear region correlate with the kinematicstructures, with the bipolar outflow and the less collimated "outflow regions"showing distinct line ratio trends. Line ratio diagnostics of high ionizationemission lines reveal non-trivial contribution from shock plus precursorionization in the NE nebula and the nuclear region, mixed with AGNphotoionization. These data are highly constraining for models of cool ionizedgas existing ~20 kpc from a galactic nucleus.

KCWI observations of the extended nebulae in Mrk 273