  The proposed DarkQuest beam dump experiment, a modest upgrade to the existing
SeaQuest/SpinQuest experiment, has great potential for uncovering new physics
within a dark sector. We explore both the near-term and long-term prospects for
observing two distinct, highly-motivated hidden sector benchmark models: heavy
neutral leptons and Higgs-mixed scalars. We comprehensively examine the
particle production and detector acceptance at DarkQuest, including an updated
treatment of meson production, and light scalar production through both
bremsstrahlung and gluon-gluon fusion. In both benchmark models, DarkQuest will
provide an opportunity to probe previously inaccessible interesting regions of
parameter space on a fairly short timescale when compared to other proposed
experiments.
