Niobium hydride is a suspected contributor to performance degradation in niobium SRF cavities for particle accelerators. Hydrogen enters niobium when the native oxide layer is stripped away during cavity preparation. The introduced hydrogen is soluble in the metal at room temperature but can precipitate out as lossy niobium hydride phases during cooldown, depending on hydrogen concentration and the time spent during cooldown in the temperature range 100-150 K. Degassing treatments are used to reduce hydrogen content in the cavities, but nanohydride phases still persist at the surface. The role that the nanohydrides play in cavity loss mechanisms is not fully understood. Here I report measurements taken on a niobium single crystal oriented to the (100) plane aimed at characterizing niobium nanohydride formation at the surface. With repeated sputtering and annealing in ultra-high vacuum (UHV) a clean (hydrogen free) atomically-flat surface can be produced on Nb-(100). I use a variable temperature (25 K – 500 K) scanning tunneling microscope (STM) to characterize the surface. It is comprised of parallel rows of (nx1)-O ladder structures that have been characterized in detail previously. The single crystal can then be doped with hydrogen to mimic the hydrogen content of technical-cavity-grade niobium coupons. As stated, niobium will absorb hydrogen from the ambient when the surface oxide is absent, and this can be accomplished in vacuum by heating the niobium to 500 °C and backfilling the vacuum chamber with ultra-high-purity hydrogen gas. The quantity of absorbed hydrogen can then be measured via residual gas analyzer when desorbed from the niobium at sample temperatures greater than 600 °C. I report X-ray photoelectron spectroscopy (XPS) measurements that confirm the presence of niobium hydrides at 100 K after hydrogen-loading. The Nb-(100) crystal is then cooled to 100 K or 25 K in the STM stage before and after hydrogen loading. Precipitates are observed with the STM at both temperatures. To distinguish between hydride precipitates and common defects such as adatoms, scanning tunneling spectroscopy (STS) is used. dI/dV is proportional to the electronic density of states. I report initial results of dI/dV curves obtained on the clean oxide surface at both 300 K and 25 K. Future plans are discussed.