  A measurement of the $^8$B solar neutrino flux has been made using a 69.2
kt-day dataset acquired with the SNO+ detector during its water commissioning
phase. At energies above 6 MeV the dataset is an extremely pure sample of solar
neutrino elastic scattering events, owing primarily to the detector's deep
location, allowing an accurate measurement with relatively little exposure. In
that energy region the best fit background rate is $0.25^{+0.09}_{-0.07}$
events/kt-day, significantly lower than the measured solar neutrino event rate
in that energy range, which is $1.03^{+0.13}_{-0.12}$ events/kt-day. Also using
data below this threshold, down to 5 MeV, fits of the solar neutrino event
direction yielded an observed flux of
$2.53^{+0.31}_{-0.28}$(stat.)$^{+0.13}_{-0.10}$(syst.)$\times10^6$
cm$^{-2}$s$^{-1}$, assuming no neutrino oscillations. This rate is consistent
with matter enhanced neutrino oscillations and measurements from other
experiments.
