We report high-cadence photometry of the ultra-fast ($t_2sim1.2$ d) nova V1674 Her during its rise to maximum light ($Vsim6.3$) and the beginning of its subsequent decline. These observations from Evryscope and the Mount Laguna Observatory All-Sky Camera reveal a plateau in the pre-maximum light curve at $gsim14$ ($sim$8 mag below peak) that lasted for at least three hours. Similar features (so-called pre-maximum halts) have been observed in some novae near maximum light, but to our knowledge the detection of a plateau in the light curve $sim$8 mag below peak is unprecedented.
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