  We study initial state momentum correlations and event-by-event geometry in
p+Pb collisions at $\sqrt{s}=5.02~\rm TeV$ by following the approach of
extending the IP-Glasma model to 3D using JIMWLK rapidity evolution. On
examining the non-trivial rapidity dependence of the observables, we find that
the geometry is correlated over large rapidity intervals, while the initial
state momentum correlations have a relatively short range in rapidity. Based on
our results, we discuss implications for the relevance of both effects in
explaining the origin of collective phenomena in small systems.
