  We investigate the ionized gas excitation and kinematics in the inner $4.3
\times 6.2$ kpc$^{2}$ of the merger radio galaxy 4C +29.30. Using optical
integral field spectroscopy with the Gemini North Telescope, we present flux
distributions, line-ratio maps, peak velocities and velocity dispersion maps as
well as channel maps with a spatial resolution of $\approx 955$ pc. We observe
high blueshifts of up to $\sim -650$ km s$^{-1}$, in a region $\sim 1''$ south
of the nucleus (the southern knot, SK), which also presents high velocity
dispersions ($\sim 250$ km s$^{-1}$), which we attribute to an outflow. A
possible redshifted counterpart is observed north from the nucleus (the
northern knot, NK). We propose that these regions correspond to a bipolar
outflow possibly due to the interaction of the radio jet with the ambient gas.
We estimate a total ionized gas mass outflow rate of $\dot{M}_{out} = 25.4
\substack{+11.5 \\ -7.5}$ M$_\odot$ yr$^{-1}$ with a kinetic power of $\dot{E}
= 8.1 \substack{+10.7 \\ -4.0} \times 10^{42}$ erg s$^{-1}$, which represents
$5.8 \substack{+7.6 \\ -2.9} \%$ of the AGN bolometric luminosity. These values
are higher than usually observed in nearby active galaxies with the same
bolometric luminosities and could imply a significant impact of the outflows in
the evolution of the host galaxy. The excitation is higher in the NK (that
correlates with extended X-ray emission, indicating the presence of hotter gas)
than in the SK, supporting a scenario in which an obscuring dust lane is
blocking part of the AGN radiation to reach the southern region of the galaxy.
